501 lines
38 KiB
HTML
501 lines
38 KiB
HTML
<!DOCTYPE html>
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<title>std::basic_string<CharT,Traits,Allocator>::insert</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_string<CharT,Traits,Allocator>::</span>insert</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-string.html">string</a>‎ | <a href="cpp-string-basic_string.html">basic string</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<td></td>
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<td rowspan="142">(1)</td>
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<td></td>
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<td>
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<div><span class="mw-geshi cpp source-cpp">basic_string<span class="sy3">&</span> insert<span class="br0">(</span> size_type index, size_type count, CharT ch <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx20">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> basic_string<span class="sy3">&</span> insert<span class="br0">(</span> size_type index, size_type count, CharT ch <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<tbody></tbody>
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<td></td>
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<td rowspan="142">(2)</td>
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<td></td>
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<tr class="t-dcl t-until-cxx20">
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<td>
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<div><span class="mw-geshi cpp source-cpp">basic_string<span class="sy3">&</span> insert<span class="br0">(</span> size_type index, <span class="kw4">const</span> CharT<span class="sy2">*</span> s <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx20">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> basic_string<span class="sy3">&</span> insert<span class="br0">(</span> size_type index, <span class="kw4">const</span> CharT<span class="sy2">*</span> s <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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</tbody>
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<tbody></tbody>
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<tbody class="t-dcl-rev t-dcl-rev-num">
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<td rowspan="142">(3)</td>
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<tr class="t-dcl t-until-cxx20">
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<div><span class="mw-geshi cpp source-cpp">basic_string<span class="sy3">&</span> insert<span class="br0">(</span> size_type index, <span class="kw4">const</span> CharT<span class="sy2">*</span> s, size_type count <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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<tr class="t-dcl t-since-cxx20">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> basic_string<span class="sy3">&</span> insert<span class="br0">(</span> size_type index,<br />
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<span class="kw4">const</span> CharT<span class="sy2">*</span> s, size_type count <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<td rowspan="142">(4)</td>
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<div><span class="mw-geshi cpp source-cpp">basic_string<span class="sy3">&</span> insert<span class="br0">(</span> size_type index, <span class="kw4">const</span> basic_string<span class="sy3">&</span> str <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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<tr class="t-dcl t-since-cxx20">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> basic_string<span class="sy3">&</span> insert<span class="br0">(</span> size_type index, <span class="kw4">const</span> basic_string<span class="sy3">&</span> str <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<td rowspan="142">(5)</td>
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<div><span class="mw-geshi cpp source-cpp">basic_string<span class="sy3">&</span> insert<span class="br0">(</span> size_type index, <span class="kw4">const</span> basic_string<span class="sy3">&</span> str,<br />
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size_type index_str, size_type count <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-until-cxx14">(C++14 前)</span></td>
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<td>
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<div><span class="mw-geshi cpp source-cpp">basic_string<span class="sy3">&</span> insert<span class="br0">(</span> size_type index, <span class="kw4">const</span> basic_string<span class="sy3">&</span> str,<br />
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size_type index_str, size_type count <span class="sy1">=</span> npos<span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx14">(C++14 起)</span><br />
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<span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx20">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> basic_string<span class="sy3">&</span> insert<span class="br0">(</span> size_type index, <span class="kw4">const</span> basic_string<span class="sy3">&</span> str,<br />
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size_type index_str, size_type count <span class="sy1">=</span> npos<span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<tbody></tbody>
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<tbody class="t-dcl-rev t-dcl-rev-num">
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<td></td>
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<td rowspan="142">(6)</td>
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<td>
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<div><span class="mw-geshi cpp source-cpp">iterator insert<span class="br0">(</span> iterator pos, CharT ch <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-until-cxx11">(C++11 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx11 t-until-cxx20">
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<td>
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<div><span class="mw-geshi cpp source-cpp">iterator insert<span class="br0">(</span> const_iterator pos, CharT ch <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span><br />
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<span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx20">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> iterator insert<span class="br0">(</span> const_iterator pos, CharT ch <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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</tr>
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</tbody>
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<tbody></tbody>
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<tbody class="t-dcl-rev t-dcl-rev-num">
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<td></td>
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<td rowspan="142">(7)</td>
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<td></td>
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<tr class="t-dcl t-until-cxx11">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> insert<span class="br0">(</span> iterator pos, size_type count, CharT ch <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-until-cxx11">(C++11 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx11 t-until-cxx20">
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<td>
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<div><span class="mw-geshi cpp source-cpp">iterator insert<span class="br0">(</span> const_iterator pos, size_type count, CharT ch <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span><br />
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<span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx20">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> iterator insert<span class="br0">(</span> const_iterator pos, size_type count, CharT ch <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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</tr>
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<tbody></tbody>
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<td></td>
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<td rowspan="142">(8)</td>
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<td></td>
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<tr class="t-dcl t-until-cxx11">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> InputIt <span class="sy1">></span><br />
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<span class="kw4">void</span> insert<span class="br0">(</span> iterator pos, InputIt first, InputIt last <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-until-cxx11">(C++11 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx11 t-until-cxx20">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> InputIt <span class="sy1">></span><br />
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iterator insert<span class="br0">(</span> const_iterator pos, InputIt first, InputIt last <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span><br />
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<span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx20">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> InputIt <span class="sy1">></span><br />
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<span class="kw4">constexpr</span> iterator insert<span class="br0">(</span> const_iterator pos, InputIt first, InputIt last <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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</tr>
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</tbody>
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<tbody></tbody>
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<tbody class="t-dcl-rev t-dcl-rev-num">
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<td></td>
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<td rowspan="142">(9)</td>
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<td></td>
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<tr class="t-dcl t-since-cxx11 t-until-cxx20">
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<div><span class="mw-geshi cpp source-cpp">iterator insert<span class="br0">(</span> const_iterator pos, <a href="cpp-utility-initializer_list.html"><span class="kw960">std::<span class="me2">initializer_list</span></span></a><span class="sy1"><</span>CharT<span class="sy1">></span> ilist <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span><br />
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<span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx20">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> iterator insert<span class="br0">(</span> const_iterator pos,<br />
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<a href="cpp-utility-initializer_list.html"><span class="kw960">std::<span class="me2">initializer_list</span></span></a><span class="sy1"><</span>CharT<span class="sy1">></span> ilist <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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</tr>
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</tbody>
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<tbody></tbody>
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<tbody class="t-dcl-rev t-dcl-rev-num">
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<tr class="t-dcl-rev-aux">
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<td></td>
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<td rowspan="142">(10)</td>
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<td></td>
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<tr class="t-dcl t-since-cxx17 t-until-cxx20">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1"><</span> <span class="kw1">class</span> T <span class="sy1">></span><br />
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basic_string<span class="sy3">&</span> insert<span class="br0">(</span> size_type pos, <span class="kw4">const</span> T<span class="sy3">&</span> t <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span><br />
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<span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx20">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1"><</span> <span class="kw1">class</span> T <span class="sy1">></span><br />
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<span class="kw4">constexpr</span> basic_string<span class="sy3">&</span> insert<span class="br0">(</span> size_type pos, <span class="kw4">const</span> T<span class="sy3">&</span> t <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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</tr>
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</tbody>
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<tbody></tbody>
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<tbody class="t-dcl-rev t-dcl-rev-num">
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<td rowspan="142">(11)</td>
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<td></td>
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<tr class="t-dcl t-since-cxx17 t-until-cxx20">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1"><</span> <span class="kw1">class</span> T <span class="sy1">></span><br /></span>
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<p>basic_string<span class="sy3">&</span> insert<span class="br0">(</span> size_type index, <span class="kw4">const</span> T<span class="sy3">&</span> t,<br /></p>
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size_type index_str, size_type count <span class="sy1">=</span> npos<span class="br0">)</span><span class="sy4">;</span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span><br />
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<span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx20">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1"><</span> <span class="kw1">class</span> T <span class="sy1">></span><br /></span>
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<p><span class="kw4">constexpr</span> basic_string<span class="sy3">&</span> insert<span class="br0">(</span> size_type index, <span class="kw4">const</span> T<span class="sy3">&</span> t,<br /></p>
|
|
size_type index_str, size_type count <span class="sy1">=</span> npos<span class="br0">)</span><span class="sy4">;</span></div>
|
|
</td>
|
|
<td class="t-dcl-nopad"></td>
|
|
<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
|
|
</tr>
|
|
</tbody>
|
|
<tbody>
|
|
<tr class="t-dcl-sep">
|
|
<td></td>
|
|
<td></td>
|
|
<td></td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>插入字符到 string 中。</p>
|
|
<div class="t-li1"><span class="t-li">1)</span> 在位置 <code>index</code> 插入 <code>count</code> 个字符 <code>ch</code> 的副本。</div>
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|
<div class="t-li1"><span class="t-li">2)</span> 在位置 <code>index</code> 插入 <code>s</code> 所指向的空终止字符串。字符串的长度由首个空字符，用 <span class="t-c"><span class="mw-geshi cpp source-cpp">Traits<span class="sy4">::</span><span class="me2">length</span><span class="br0">(</span>s<span class="br0">)</span></span></span> 确定。</div>
|
|
<div class="t-li1"><span class="t-li">3)</span> 在位置 <code>index</code> 插入范围 <code>[s, s+count)</code> 中的字符。范围能含有空字符。</div>
|
|
<div class="t-li1"><span class="t-li">4)</span> 在位置 <code>index</code> 插入 string <code>str</code> 。</div>
|
|
<div class="t-li1"><span class="t-li">5)</span> 在位置 <code>index</code> 插入由 <span class="t-c"><span class="mw-geshi cpp source-cpp">str.<span class="me1">substr</span><span class="br0">(</span>index_str, count<span class="br0">)</span></span></span> 获得的 string 。</div>
|
|
<div class="t-li1"><span class="t-li">6)</span> 在 <code>pos</code> 所指向的字符前插入字符 <code>ch</code> 。</div>
|
|
<div class="t-li1"><span class="t-li">7)</span> 在 <code>pos</code> 所指向的元素（若存在）前插入 <code>count</code> 个字符 <code>ch</code> 的副本。</div>
|
|
<div class="t-li1"><span class="t-li">8)</span> 在 <code>pos</code> 所指向的元素（若存在）前插入来自范围 <code>[first, last)</code> 的元素。<span class="t-rev-inl t-since-cxx11"><span>若 <code>InputIt</code> 不满足<a href="cpp-named_req-InputIterator.html"><span style="font-style:italic">老式输入迭代器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyInputIterator)</span></a> 则此重载不参与重载决议。</span> <span><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></span></span></div>
|
|
<div class="t-li1"><span class="t-li">9)</span> 在 <code>pos</code> 所指向的元素（若存在）前插入来自 initializer_list <code>ilist</code> 的字符。</div>
|
|
<div class="t-li1"><span class="t-li">10)</span> 如同用 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string_view.html"><span class="kw1246">std::<span class="me2">basic_string_view</span></span></a><span class="sy1"><</span>CharT, Traits<span class="sy1">></span> sv <span class="sy1">=</span> t<span class="sy4">;</span></span></span> 隐式转换 <code>t</code> 为 string_view <code>sv</code> ，然后如同用 <span class="t-c"><span class="mw-geshi cpp source-cpp">insert<span class="br0">(</span>pos, sv.<span class="me1">data</span><span class="br0">(</span><span class="br0">)</span>, sv.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> ，在 <code>pos</code> 所指向的元素（若存在）前插入来自 <code>sv</code> 的元素。此重载仅若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_convertible.html"><span class="kw593">std::<span class="me2">is_convertible_v</span></span></a><span class="sy1"><</span><span class="kw4">const</span> T<span class="sy3">&</span>, <a href="cpp-string-basic_string_view.html"><span class="kw1246">std::<span class="me2">basic_string_view</span></span></a><span class="sy1"><</span>CharT, Traits<span class="sy1">>></span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 且 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_convertible.html"><span class="kw593">std::<span class="me2">is_convertible_v</span></span></a><span class="sy1"><</span><span class="kw4">const</span> T<span class="sy3">&</span>, <span class="kw4">const</span> CharT<span class="sy2">*</span><span class="sy1">></span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 才参与重载决议。</div>
|
|
<div class="t-li1"><span class="t-li">11)</span> 如同用 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string_view.html"><span class="kw1246">std::<span class="me2">basic_string_view</span></span></a><span class="sy1"><</span>CharT, Traits<span class="sy1">></span> sv <span class="sy1">=</span> t<span class="sy4">;</span></span></span> 隐式转换 <code>t</code> 为 string_view <code>sv</code> ，然后在 <code>pos</code> 所指向的元素（若存在）前插入来自 <code>sv</code> 的子视图 <code>[index_str, index_str+count)</code> 的元素。若请求的子视图越过 <code>sv</code> 的末尾，或若 <span class="t-c"><span class="mw-geshi cpp source-cpp">count <span class="sy1">==</span> npos</span></span> ，则作为结果的子视图是 <code>[index_str, sv.size())</code> 。若 <span class="t-c"><span class="mw-geshi cpp source-cpp">index_str <span class="sy1">></span> sv.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span></span></span> 或若 <span class="t-c"><span class="mw-geshi cpp source-cpp">index <span class="sy1">></span> size<span class="br0">(</span><span class="br0">)</span></span></span> ，则抛出 <span class="t-lc"><a href="cpp-error-out_of_range.html">std::out_of_range</a></span> 。此重载仅若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_convertible.html"><span class="kw593">std::<span class="me2">is_convertible_v</span></span></a><span class="sy1"><</span><span class="kw4">const</span> T<span class="sy3">&</span>, <a href="cpp-string-basic_string_view.html"><span class="kw1246">std::<span class="me2">basic_string_view</span></span></a><span class="sy1"><</span>CharT, Traits<span class="sy1">>></span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 且 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_convertible.html"><span class="kw593">std::<span class="me2">is_convertible_v</span></span></a><span class="sy1"><</span><span class="kw4">const</span> T<span class="sy3">&</span>, <span class="kw4">const</span> CharT<span class="sy2">*</span><span class="sy1">></span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 才参与重载决议。</div>
|
|
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
|
|
<table class="t-par-begin">
|
|
<tr class="t-par">
|
|
<td>index</td>
|
|
<td>-</td>
|
|
<td>插入内容到的位置</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>pos</td>
|
|
<td>-</td>
|
|
<td>将插入字符到其前的迭代器</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>ch</td>
|
|
<td>-</td>
|
|
<td>要插入的字符</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>count</td>
|
|
<td>-</td>
|
|
<td>要插入的字符数</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>s</td>
|
|
<td>-</td>
|
|
<td>指向要插入的字符串的指针</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>str</td>
|
|
<td>-</td>
|
|
<td>要插入的 string</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>first, last</td>
|
|
<td>-</td>
|
|
<td>定义要插入字符的范围</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>index_str</td>
|
|
<td>-</td>
|
|
<td>string <code>str</code> 中要插入的首字符位置</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>ilist</td>
|
|
<td>-</td>
|
|
<td>要插入的字符来源的 <span class="t-lc"><a href="cpp-utility-initializer_list.html">std::initializer_list</a></span></td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>t</td>
|
|
<td>-</td>
|
|
<td>要插入的字符来源对象（可转换为 <span class="t-lc"><a href="cpp-string-basic_string_view.html">std::basic_string_view</a></span> ）</td>
|
|
</tr>
|
|
<tr class="t-par-hitem">
|
|
<td colspan="3">类型要求</td>
|
|
</tr>
|
|
<tr class="t-par-req">
|
|
<td colspan="3">-
|
|
<div class="spacer"></div>
|
|
<code>InputIt</code> 必须满足<a href="cpp-named_req-InputIterator.html"><span style="font-style:italic">老式输入迭代器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyInputIterator)</span></a> 的要求。</td>
|
|
</tr>
|
|
</table>
|
|
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
|
|
<div class="t-li1"><span class="t-li">1-5,10-11)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span></div>
|
|
<div class="t-li1"><span class="t-li">6-9)</span> 指代首个被插入字符的迭代器，或若未插入字符则为 <code>pos</code> （ <code>count == 0</code> 或 <code>ilist.size() == 0</code> 或 <code>first == last</code> ）</div>
|
|
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
|
|
<div class="t-li1"><span class="t-li">1-4, 10)</span> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">index <span class="sy1">></span> size<span class="br0">(</span><span class="br0">)</span></span></span> 则为 <span class="t-lc"><a href="cpp-error-out_of_range.html">std::out_of_range</a></span> 。</div>
|
|
<div class="t-li1"><span class="t-li">5)</span> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">index <span class="sy1">></span> size<span class="br0">(</span><span class="br0">)</span></span></span> 或若 <span class="t-c"><span class="mw-geshi cpp source-cpp">index_str <span class="sy1">></span> str.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span></span></span> 则抛出 <span class="t-lc"><a href="cpp-error-out_of_range.html">std::out_of_range</a></span> 。</div>
|
|
<div class="t-li1"><span class="t-li">11)</span> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">index <span class="sy1">></span> size<span class="br0">(</span><span class="br0">)</span></span></span> 或若 <span class="t-c"><span class="mw-geshi cpp source-cpp">index_str <span class="sy1">></span> sv.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span></span></span> 则抛出 <span class="t-lc"><a href="cpp-error-out_of_range.html">std::out_of_range</a></span> 。</div>
|
|
<p>所有情况下，若 <span class="t-c"><span class="mw-geshi cpp source-cpp">size<span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> ins_count <span class="sy1">></span> max_size<span class="br0">(</span><span class="br0">)</span></span></span> 则抛出 <span class="t-lc"><a href="cpp-error-length_error.html">std::length_error</a></span> ，其中 <code>ins_count</code> 是将要插入的字符数。并且可能抛出 <code>Allocator::allocate</code> 所抛的任何异常。</p>
|
|
<table class="t-rev-begin">
|
|
<tr class="t-rev t-since-cxx11">
|
|
<td>
|
|
<p>任何情况下，若因任何原因抛异常，则此函数无效果（强异常保证）。</p>
|
|
</td>
|
|
<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
|
|
</tr>
|
|
</table>
|
|
<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">缺陷报告</span></h3>
|
|
<p>下列更改行为的缺陷报告追溯地应用于以前出版的 C++ 标准。</p>
|
|
<table class="dsctable" style="font-size:0.8em">
|
|
<tr>
|
|
<th>DR</th>
|
|
<th>应用于</th>
|
|
<th>出版时的行为</th>
|
|
<th>正确行为</th>
|
|
</tr>
|
|
<tr>
|
|
<td><a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue2946">LWG 2946</a></td>
|
|
<td>C++17</td>
|
|
<td><code>string_view</code> 重载在某些情况下导致歧义</td>
|
|
<td>通过使之为模板来避免</td>
|
|
</tr>
|
|
</table>
|
|
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
|
|
<div class="t-example">
|
|
<div class="t-example-live-link"></div>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="co2">#include <cassert></span>
|
|
<span class="co2">#include <iterator></span>
|
|
<span class="co2">#include <string></span>
|
|
<span class="kw1">using</span> <span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">string_literals</span><span class="sy4">;</span>
|
|
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
|
|
<span class="br0">{</span>
|
|
<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> s <span class="sy1">=</span> <span class="st0">"xmplr"</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// insert(size_type index, size_type count, char ch)</span>
|
|
s.<span class="me1">insert</span><span class="br0">(</span><span class="nu0">0</span>, <span class="nu0">1</span>, <span class="st0">'E'</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span><span class="st0">"Exmplr"</span> <span class="sy1">==</span> s<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// insert(size_type index, const char* s)</span>
|
|
s.<span class="me1">insert</span><span class="br0">(</span><span class="nu0">2</span>, <span class="st0">"e"</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span><span class="st0">"Exemplr"</span> <span class="sy1">==</span> s<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// insert(size_type index, string const& str)</span>
|
|
s.<span class="me1">insert</span><span class="br0">(</span><span class="nu0">6</span>, <span class="st0">"a"</span>s<span class="br0">)</span><span class="sy4">;</span>
|
|
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span><span class="st0">"Exemplar"</span> <span class="sy1">==</span> s<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// insert(size_type index, string const& str,</span>
|
|
<span class="co1">// size_type index_str, size_type count)</span>
|
|
s.<span class="me1">insert</span><span class="br0">(</span><span class="nu0">8</span>, <span class="st0">" is an example string."</span>s, <span class="nu0">0</span>, <span class="nu0">14</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span><span class="st0">"Exemplar is an example"</span> <span class="sy1">==</span> s<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// insert(const_iterator pos, char ch)</span>
|
|
s.<span class="me1">insert</span><span class="br0">(</span>s.<span class="me1">cbegin</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> s.<span class="me1">find_first_of</span><span class="br0">(</span><span class="st0">'n'</span><span class="br0">)</span> <span class="sy2">+</span> <span class="nu0">1</span>, <span class="st0">':'</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span><span class="st0">"Exemplar is an: example"</span> <span class="sy1">==</span> s<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// insert(const_iterator pos, size_type count, char ch)</span>
|
|
s.<span class="me1">insert</span><span class="br0">(</span>s.<span class="me1">cbegin</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> s.<span class="me1">find_first_of</span><span class="br0">(</span><span class="st0">':'</span><span class="br0">)</span> <span class="sy2">+</span> <span class="nu0">1</span>, <span class="nu0">2</span>, <span class="st0">'='</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span><span class="st0">"Exemplar is an:== example"</span> <span class="sy1">==</span> s<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// insert(const_iterator pos, InputIt first, InputIt last)</span>
|
|
<span class="br0">{</span>
|
|
<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> seq <span class="sy1">=</span> <span class="st0">" string"</span><span class="sy4">;</span>
|
|
s.<span class="me1">insert</span><span class="br0">(</span>s.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> s.<span class="me1">find_last_of</span><span class="br0">(</span><span class="st0">'e'</span><span class="br0">)</span> <span class="sy2">+</span> <span class="nu0">1</span>,
|
|
<a href="cpp-iterator-begin.html"><span class="kw676">std::<span class="me2">begin</span></span></a><span class="br0">(</span>seq<span class="br0">)</span>, <a href="cpp-iterator-end.html"><span class="kw680">std::<span class="me2">end</span></span></a><span class="br0">(</span>seq<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span><span class="st0">"Exemplar is an:== example string"</span> <span class="sy1">==</span> s<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
|
|
<span class="co1">// insert(const_iterator pos, std::initializer_list<char>)</span>
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s.<span class="me1">insert</span><span class="br0">(</span>s.<span class="me1">cbegin</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> s.<span class="me1">find_first_of</span><span class="br0">(</span><span class="st0">'g'</span><span class="br0">)</span> <span class="sy2">+</span> <span class="nu0">1</span>, <span class="br0">{</span> <span class="st0">'.'</span> <span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span><span class="st0">"Exemplar is an:== example string."</span> <span class="sy1">==</span> s<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-basic_string-append.html"><span class="t-lines"><span>append</span></span></a></div>
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</div>
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</td>
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<td>后附字符到结尾<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-basic_string-push_back.html"><span class="t-lines"><span>push_back</span></span></a></div>
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</div>
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</td>
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<td>后附字符到结尾<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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</div>
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</div>
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</body>
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</html>
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