523 lines
34 KiB
HTML
523 lines
34 KiB
HTML
<!DOCTYPE html>
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<title>std::basic_string<CharT,Traits,Allocator>::replace</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_string_basic_string_replace skin-cppreference2 action-view cpp-navbar">
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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>replace</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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<table class="t-dcl-begin">
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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">(1)</td>
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<td></td>
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</tr>
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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> replace<span class="br0">(</span> size_type pos, size_type count,<br />
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<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>
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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> replace<span class="br0">(</span> size_type pos, size_type count,<br />
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<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>
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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">(1)</td>
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<td></td>
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</tr>
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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> replace<span class="br0">(</span> const_iterator first, const_iterator last,<br />
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<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>
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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> replace<span class="br0">(</span> const_iterator first, const_iterator last,<br />
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<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>
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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">(2)</td>
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<td></td>
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<tr class="t-dcl t-until-cxx14">
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<td>
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<div><span class="mw-geshi cpp source-cpp">basic_string<span class="sy3">&</span> replace<span class="br0">(</span> size_type pos, size_type count,<br /></span>
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<p> <span class="kw4">const</span> basic_string<span class="sy3">&</span> str,<br /></p>
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size_type pos2, size_type count2 <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-until-cxx14">(C++14 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx14 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> replace<span class="br0">(</span> size_type pos, size_type count,<br /></span>
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<p> <span class="kw4">const</span> basic_string<span class="sy3">&</span> str,<br /></p>
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size_type pos2, size_type count2 <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-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> replace<span class="br0">(</span> size_type pos, size_type count,<br /></span>
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<p> <span class="kw4">const</span> basic_string<span class="sy3">&</span> str,<br /></p>
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size_type pos2, size_type count2 <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-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">(3)</td>
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<td></td>
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<tr class="t-dcl t-until-cxx20">
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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 /></span>
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<p>basic_string<span class="sy3">&</span> replace<span class="br0">(</span> const_iterator first, const_iterator last,<br /></p>
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InputIt first2, InputIt last2 <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-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 /></span>
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<p><span class="kw4">constexpr</span> basic_string<span class="sy3">&</span> replace<span class="br0">(</span> const_iterator first, const_iterator last,<br /></p>
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InputIt first2, InputIt last2 <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-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">(4)</td>
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<td></td>
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</tr>
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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> replace<span class="br0">(</span> size_type pos, size_type count,<br />
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<span class="kw4">const</span> CharT<span class="sy2">*</span> cstr, size_type count2 <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> replace<span class="br0">(</span> size_type pos, size_type count,<br />
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<span class="kw4">const</span> CharT<span class="sy2">*</span> cstr, size_type count2 <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">(4)</td>
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<td></td>
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</tr>
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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> replace<span class="br0">(</span> const_iterator first, const_iterator last,<br />
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<span class="kw4">const</span> CharT<span class="sy2">*</span> cstr, size_type count2 <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> replace<span class="br0">(</span> const_iterator first, const_iterator last,<br />
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<span class="kw4">const</span> CharT<span class="sy2">*</span> cstr, size_type count2 <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">(5)</td>
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<td></td>
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</tr>
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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> replace<span class="br0">(</span> size_type pos, size_type count,<br />
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<span class="kw4">const</span> CharT<span class="sy2">*</span> cstr <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> replace<span class="br0">(</span> size_type pos, size_type count,<br />
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<span class="kw4">const</span> CharT<span class="sy2">*</span> cstr <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">(5)</td>
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<td></td>
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</tr>
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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> replace<span class="br0">(</span> const_iterator first, const_iterator last,<br />
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<span class="kw4">const</span> CharT<span class="sy2">*</span> cstr <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> replace<span class="br0">(</span> const_iterator first, const_iterator last,<br />
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<span class="kw4">const</span> CharT<span class="sy2">*</span> cstr <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">(6)</td>
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<td></td>
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</tr>
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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> replace<span class="br0">(</span> size_type pos, size_type count,<br />
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size_type count2, 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> replace<span class="br0">(</span> size_type pos, size_type count,<br />
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size_type count2, 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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<tr class="t-dcl-rev-aux">
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<td></td>
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<td rowspan="142">(6)</td>
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<td></td>
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</tr>
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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> replace<span class="br0">(</span> const_iterator first, const_iterator last,<br />
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size_type count2, 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> replace<span class="br0">(</span> const_iterator first, const_iterator last,<br />
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size_type count2, 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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<tr class="t-dcl-rev-aux">
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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>
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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">basic_string<span class="sy3">&</span> replace<span class="br0">(</span> const_iterator first, const_iterator last,<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-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> basic_string<span class="sy3">&</span> replace<span class="br0">(</span> const_iterator first, const_iterator last,<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">(8)</td>
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<td></td>
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</tr>
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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> replace<span class="br0">(</span> size_type pos, size_type count,<br /></p>
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<span class="kw4">const</span> T<span class="sy3">&</span> t <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 />
|
|
<span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
|
|
</tr>
|
|
<tr class="t-dcl t-since-cxx20">
|
|
<td>
|
|
<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>
|
|
<p><span class="kw4">constexpr</span> basic_string<span class="sy3">&</span> replace<span class="br0">(</span> size_type pos, size_type count,<br /></p>
|
|
<span class="kw4">const</span> T<span class="sy3">&</span> t <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></tbody>
|
|
<tbody class="t-dcl-rev t-dcl-rev-num">
|
|
<tr class="t-dcl-rev-aux">
|
|
<td></td>
|
|
<td rowspan="142">(8)</td>
|
|
<td></td>
|
|
</tr>
|
|
<tr class="t-dcl t-since-cxx17 t-until-cxx20">
|
|
<td>
|
|
<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>
|
|
<p>basic_string<span class="sy3">&</span> replace<span class="br0">(</span> const_iterator first, const_iterator last,<br /></p>
|
|
<span class="kw4">const</span> T<span class="sy3">&</span> t <span class="br0">)</span><span class="sy4">;</span></div>
|
|
</td>
|
|
<td class="t-dcl-nopad"></td>
|
|
<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span><br />
|
|
<span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
|
|
</tr>
|
|
<tr class="t-dcl t-since-cxx20">
|
|
<td>
|
|
<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>
|
|
<p><span class="kw4">constexpr</span> basic_string<span class="sy3">&</span> replace<span class="br0">(</span> const_iterator first, const_iterator last,<br /></p>
|
|
<span class="kw4">const</span> T<span class="sy3">&</span> t <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></tbody>
|
|
<tbody class="t-dcl-rev t-dcl-rev-num">
|
|
<tr class="t-dcl-rev-aux">
|
|
<td></td>
|
|
<td rowspan="142">(9)</td>
|
|
<td></td>
|
|
</tr>
|
|
<tr class="t-dcl t-since-cxx17 t-until-cxx20">
|
|
<td>
|
|
<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>
|
|
<p>basic_string<span class="sy3">&</span> replace<span class="br0">(</span> size_type pos, size_type count, <span class="kw4">const</span> T<span class="sy3">&</span> t,<br /></p>
|
|
size_type pos2, size_type count2 <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-cxx17">(C++17 起)</span><br />
|
|
<span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
|
|
</tr>
|
|
<tr class="t-dcl t-since-cxx20">
|
|
<td>
|
|
<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>
|
|
<p><span class="kw4">constexpr</span> basic_string<span class="sy3">&</span> replace<span class="br0">(</span> size_type pos, size_type count, <span class="kw4">const</span> T<span class="sy3">&</span> t,<br /></p>
|
|
size_type pos2, size_type count2 <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>以新字符串替换 <code>[pos, pos + count)</code> 或 <code>[first, last)</code> 所指示的 string 部分。</p>
|
|
<p>新字符串可以是下列之一：</p>
|
|
<div class="t-li1"><span class="t-li">1)</span> string <code>str</code> ；</div>
|
|
<div class="t-li1"><span class="t-li">2)</span> <code>str</code> 的子串 <code>[pos2, pos2 + count2)</code> ，除了若 <span class="t-c"><span class="mw-geshi cpp source-cpp">count2<span class="sy1">==</span>npos</span></span> 或若它可能越过 <span class="t-c"><span class="mw-geshi cpp source-cpp">str.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span></span></span> ，则使用 <code>[pos2, str.size())</code> 。</div>
|
|
<div class="t-li1"><span class="t-li">3)</span> 范围 <code>[first2, last2)</code> 中的字符。
|
|
<table class="t-rev-begin">
|
|
<tr class="t-rev t-until-cxx11">
|
|
<td>
|
|
<p>若 <code>InputIt</code> 为整数类型则此重载与 <span class="t-v">(6)</span> 拥有相同效果。</p>
|
|
</td>
|
|
<td><span class="t-mark-rev t-until-cxx11">(C++11 前)</span></td>
|
|
</tr>
|
|
<tr class="t-rev t-since-cxx11">
|
|
<td>
|
|
<p>此重载仅若 <code>InputIt</code> 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> 的要求才参与重载决议。</p>
|
|
</td>
|
|
<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
<div class="t-li1"><span class="t-li">4)</span> 范围 <code>[cstr, cstr + count2)</code> 中的字符；</div>
|
|
<div class="t-li1"><span class="t-li">5)</span> 范围 <code>[cstr, cstr + Traits::length(cstr))</code> 中的字符；</div>
|
|
<div class="t-li1"><span class="t-li">6)</span> 字符 <code>ch</code> 的 <code>count2</code> 个副本；</div>
|
|
<div class="t-li1"><span class="t-li">7)</span> initializer_list <code>ilist</code> 中的字符；</div>
|
|
<div class="t-li1"><span class="t-li">8)</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> 从 <code>t</code> 转换而来的 string_view <code>sv</code> 的字符。这些重载仅若<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">9)</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> 从 <code>t</code> 转换而得的字符串视图 <code>sv</code> 的子视图 <code>[pos2, pos2 + count2)</code> ，除了若 <span class="t-c"><span class="mw-geshi cpp source-cpp">count2<span class="sy1">==</span>npos</span></span> 或它将越过 <span class="t-c"><span class="mw-geshi cpp source-cpp">sv.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span></span></span> ，则使用 <code>[pos2, sv.size())</code> 。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>pos</td>
|
|
<td>-</td>
|
|
<td>将被替换的子串起始位置</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>count</td>
|
|
<td>-</td>
|
|
<td>将被替换的子串长度</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>first, last</td>
|
|
<td>-</td>
|
|
<td>将被替换的字符范围</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>str</td>
|
|
<td>-</td>
|
|
<td>用于替换的 string</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>pos2</td>
|
|
<td>-</td>
|
|
<td>用于替换的子串起始位置</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>count2</td>
|
|
<td>-</td>
|
|
<td>用于替换的字符数</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>cstr</td>
|
|
<td>-</td>
|
|
<td>指向用于替换的字符串的指针</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>ch</td>
|
|
<td>-</td>
|
|
<td>用于替换的字符值</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>first2, last2</td>
|
|
<td>-</td>
|
|
<td>用于替换的字符范围</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>ilist</td>
|
|
<td>-</td>
|
|
<td>拥有用于替换的字符的 initializer_list</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>t</td>
|
|
<td>-</td>
|
|
<td>拥有用于替换的字符的对象（可转换为 <span class="t-lc"><a href="cpp-string-basic_string_view.html">std::basic_string_view</a></span> ）</td>
|
|
</tr>
|
|
</table>
|
|
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
|
|
<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span></p>
|
|
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
|
|
<p>若 <code>pos > length()</code> 或 <code>pos2 > str.length()</code> 则为 <span class="t-lc"><a href="cpp-error-out_of_range.html">std::out_of_range</a></span></p>
|
|
<p>若产生的 string 将超出最大可能 string 长度（ <code><span class="t-lc"><a href="cpp-string-basic_string-max_size.html">max_size()</a></span> - 1</code> ）则为 <span class="t-lc"><a href="cpp-error-length_error.html">std::length_error</a></span> 。</p>
|
|
<p><span class="t-rev-inl t-since-cxx11"><span>任何情况下，若因任何原因抛出异常，则此函数无效果（强异常保证）。</span> <span><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></span></span></p>
|
|
<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 <iostream></span>
|
|
<span class="co2">#include <string></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> str<span class="br0">(</span><span class="st0">"The quick brown fox jumps over the lazy dog."</span><span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
str.<span class="me1">replace</span><span class="br0">(</span><span class="nu0">10</span>, <span class="nu0">5</span>, <span class="st0">"red"</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// (5)</span>
|
|
|
|
str.<span class="me1">replace</span><span class="br0">(</span>str.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, str.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> <span class="nu0">3</span>, <span class="nu0">1</span>, <span class="st0">'A'</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// (6)</span>
|
|
|
|
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> str <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<p>输出：</p>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="text source-text">
|
|
<pre class="de1">A quick red fox jumps over the lazy dog.</pre></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="visualClear"></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html>
|