263 lines
26 KiB
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263 lines
26 KiB
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<title>std::span<T,Extent>::span</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::span<T,Extent>::</span>span</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-container.html">container</a>‎ | <a href="cpp-container-span.html">span</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> span<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(1)</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> It <span class="sy1">></span><br /></span>
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<p><span class="kw1">explicit</span><span class="br0">(</span>extent <span class="sy3">!</span><span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">dynamic_extent</span><span class="br0">)</span><br /></p>
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<span class="kw4">constexpr</span> span<span class="br0">(</span> It first, size_type count <span class="br0">)</span><span class="sy4">;</span></div>
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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> It, <span class="kw1">class</span> End <span class="sy1">></span><br /></span>
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<p><span class="kw1">explicit</span><span class="br0">(</span>extent <span class="sy3">!</span><span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">dynamic_extent</span><span class="br0">)</span><br /></p>
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<span class="kw4">constexpr</span> span<span class="br0">(</span> It first, End last <span class="br0">)</span><span class="sy4">;</span></div>
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<td>(3)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> N <span class="sy1">></span><br />
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<span class="kw4">constexpr</span> span<span class="br0">(</span> element_type <span class="br0">(</span><span class="sy3">&</span>arr<span class="br0">)</span><span class="br0">[</span>N<span class="br0">]</span> <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(4)</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> U, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> N <span class="sy1">></span><br />
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<span class="kw4">constexpr</span> span<span class="br0">(</span> <a href="cpp-container-array.html"><span class="kw1268">std::<span class="me2">array</span></span></a><span class="sy1"><</span>U, N<span class="sy1">></span><span class="sy3">&</span> arr <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(5)</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> U, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> N <span class="sy1">></span><br />
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<span class="kw4">constexpr</span> span<span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-container-array.html"><span class="kw1268">std::<span class="me2">array</span></span></a><span class="sy1"><</span>U, N<span class="sy1">></span><span class="sy3">&</span> arr <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(6)</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> R <span class="sy1">></span><br /></span>
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<p><span class="kw1">explicit</span><span class="br0">(</span>extent <span class="sy3">!</span><span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">dynamic_extent</span><span class="br0">)</span><br /></p>
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<span class="kw4">constexpr</span> span<span class="br0">(</span> R<span class="sy3">&&</span> range <span class="br0">)</span><span class="sy4">;</span></div>
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<td>(7)</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> U, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> N <span class="sy1">></span><br /></span>
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<p><span class="kw1">explicit</span><span class="br0">(</span>extent <span class="sy3">!</span><span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">dynamic_extent</span> <span class="sy3">&&</span> N <span class="sy1">==</span> std<span class="sy4">::</span><span class="me2">dynamic_extent</span><span class="br0">)</span><br /></p>
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<span class="kw4">constexpr</span> span<span class="br0">(</span> <span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">span</span><span class="sy1"><</span>U, N<span class="sy1">></span><span class="sy3">&</span> s <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td>(8)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> span<span class="br0">(</span> <span class="kw4">const</span> span<span class="sy3">&</span> other <span class="br0">)</span> <span class="kw1">noexcept</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span></span></div>
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<td>(9)</td>
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<p>构造 <code>span</code> 。</p>
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<div class="t-li1"><span class="t-li">1)</span> 构造空 span 使其 <span class="t-c"><span class="mw-geshi cpp source-cpp">data<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> nullptr</span></span> 而 <span class="t-c"><span class="mw-geshi cpp source-cpp">size<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">0</span></span></span> 。
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<li>此重载仅若<span class="t-c"><span class="mw-geshi cpp source-cpp">extent <span class="sy1">==</span> <span class="nu0">0</span> <span class="sy3">||</span> extent <span class="sy1">==</span> std<span class="sy4">::</span><span class="me2">dynamic_extent</span></span></span>才参与重载决议。</li>
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<div class="t-li1"><span class="t-li">2)</span> 构造作为范围 <code>[first, first + count)</code> 上的视图的 span ；产生的 span 有 <span class="t-c"><span class="mw-geshi cpp source-cpp">data<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> std<span class="sy4">::</span><span class="me2">to_address</span><span class="br0">(</span>first<span class="br0">)</span></span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">size<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> count</span></span> 。
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<li>若 <code>[first, first + count)</code> 不是合法范围，若 <code>It</code> 不实际实现 <a href="cpp-iterator-contiguous_iterator.html"><code>contiguous_iterator</code></a> 或若 <span class="t-c"><span class="mw-geshi cpp source-cpp">extent <span class="sy3">!</span><span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">dynamic_extent</span> <span class="sy3">&&</span> count <span class="sy3">!</span><span class="sy1">=</span> extent</span></span> 则行为未定义。这些重载仅若</li>
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<li><code>It</code> 满足 <a href="cpp-iterator-contiguous_iterator.html"><code>contiguous_iterator</code></a></li>
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<li>从 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">iter_reference_t</span><span class="sy1"><</span>It<span class="sy1">></span></span></span> 到 <span class="t-c"><span class="mw-geshi cpp source-cpp">element_type</span></span> 的转换至多为限定转换</li>
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</ul>
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</dd>
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才参与重载决议。</div>
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<div class="t-li1"><span class="t-li">3)</span> 构造作为范围 <code>[first, last)</code> 上的视图的 span ；产生的 span 有 <span class="t-c"><span class="mw-geshi cpp source-cpp">data<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> std<span class="sy4">::</span><span class="me2">to_address</span><span class="br0">(</span>first<span class="br0">)</span></span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">size<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> last<span class="sy2">-</span>first</span></span> 。若 <code>[first, last)</code> 不是合法范围，若 <code>It</code> 不实际实现 <a href="cpp-iterator-contiguous_iterator.html"><code>contiguous_iterator</code></a> ，若 <code>End</code> 不实际实现 <code>It</code> 的 <a href="cpp-iterator-sized_sentinel_for.html"><code>sized_sentinel_for</code></a> ，或若 <span class="t-c"><span class="mw-geshi cpp source-cpp">extent <span class="sy3">!</span><span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">dynamic_extent</span> <span class="sy3">&&</span> last<span class="sy2">-</span>first <span class="sy3">!</span><span class="sy1">=</span> extent</span></span> 则行为未定义。
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<ul>
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<li>此重载仅若</li>
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</ul>
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<li><code>It</code> 满足 <a href="cpp-iterator-contiguous_iterator.html"><code>contiguous_iterator</code></a> ，</li>
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<li><code>End</code> 满足 <code>It</code> 的 <a href="cpp-iterator-sized_sentinel_for.html"><code>sized_sentinel_for</code></a> ，</li>
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<li>从 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">iter_reference_t</span><span class="sy1"><</span>It<span class="sy1">></span></span></span> 到 <span class="t-c"><span class="mw-geshi cpp source-cpp">element_type</span></span> 的转换至多为限定转换，且</li>
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<li><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>End, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a><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></li>
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</dd>
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才参与重载决议。</div>
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<div class="t-li1"><span class="t-li">4-6)</span> 构造作为数组 <code>arr</code> 上的视图的 span ；产生的 span 有 <span class="t-c"><span class="mw-geshi cpp source-cpp">size<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> N</span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">data<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <a href="cpp-iterator-data.html"><span class="kw686">std::<span class="me2">data</span></span></a><span class="br0">(</span>arr<span class="br0">)</span></span></span> 。
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<ul>
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<li>这些重载仅若<span class="t-c"><span class="mw-geshi cpp source-cpp">extent <span class="sy1">==</span> std<span class="sy4">::</span><span class="me2">dynamic_extent</span> <span class="sy3">||</span> N <span class="sy1">==</span> extent</span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 且从 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-remove_pointer.html"><span class="kw613">std::<span class="me2">remove_pointer_t</span></span></a><span class="sy1"><</span>decltype<span class="br0">(</span><a href="cpp-iterator-data.html"><span class="kw686">std::<span class="me2">data</span></span></a><span class="br0">(</span>arr<span class="br0">)</span><span class="br0">)</span><span class="sy1">></span></span></span> 到 <span class="t-c"><span class="mw-geshi cpp source-cpp">element_type</span></span> 的转换至多为限定转换才参与重载决议。这些构造函数模板决不用于类模板实参推导。</li>
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<div class="t-li1"><span class="t-li">7)</span> 构造作为范围 <code>range</code> 上的视图的 span ；产生的 span 有 <span class="t-c"><span class="mw-geshi cpp source-cpp">size<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">size</span><span class="br0">(</span>r<span class="br0">)</span></span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">data<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">data</span><span class="br0">(</span>range<span class="br0">)</span></span></span> 。
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<li>若 <code>R</code> 不实际实现 <a href="cpp-ranges-contiguous_range.html"><code>contiguous_range</code></a> 与 <a href="cpp-ranges-sized_range.html"><code>sized_range</code></a> 或当 <span class="t-c"><span class="mw-geshi cpp source-cpp">element_type</span></span> 为非 const 时 <code>R</code> 不实际实现 <a href="cpp-ranges-borrowed_range.html"><code>borrowed_range</code></a> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp">extent <span class="sy3">!</span><span class="sy1">=</span> dynamic_extent</span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">size</span><span class="br0">(</span>range<span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> extent</span></span> 均为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 则行为未定义。</li>
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<li>此重载仅若</li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">extent <span class="sy1">==</span> dynamic_extent</span></span> ；</li>
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<li><code>R</code> 满足 <a href="cpp-ranges-contiguous_range.html"><code>contiguous_range</code></a> 与 <a href="cpp-ranges-sized_range.html"><code>sized_range</code></a> ，</li>
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<li><code>R</code> 满足 <a href="cpp-ranges-borrowed_range.html"><code>borrowed_range</code></a> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_const.html"><span class="kw495">std::<span class="me2">is_const_v</span></span></a><span class="sy1"><</span>element_type<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></li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">remove_cvref_t</span><span class="sy1"><</span>R<span class="sy1">></span></span></span> 不是 <code>std::span</code> 的特化，</li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">remove_cvref_t</span><span class="sy1"><</span>R<span class="sy1">></span></span></span> 不是 <span class="t-lc"><a href="cpp-container-array.html">std::array</a></span> 的特化，</li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_array.html"><span class="kw461">std::<span class="me2">is_array_v</span></span></a><span class="sy1"><</span>std<span class="sy4">::</span><span class="me2">remove_cvref_t</span><span class="sy1"><</span>R<span class="sy1">>></span></span></span> 为 false ，且</li>
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<li>从 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">range_reference_t</span><span class="sy1"><</span>R<span class="sy1">></span></span></span> 到 <span class="t-c"><span class="mw-geshi cpp source-cpp">element_type</span></span> 的转换至多为限定转换</li>
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</dd>
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才参与重载决议。</div>
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<div class="t-li1"><span class="t-li">8)</span> 从另一 span <code>source</code> 的转换构造函数；产生的 span 有 <span class="t-c"><span class="mw-geshi cpp source-cpp">size<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> source.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span></span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">data<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> source.<span class="me1">data</span><span class="br0">(</span><span class="br0">)</span></span></span> 。
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<ul>
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<li>若 <span class="t-c"><span class="mw-geshi cpp source-cpp">extent <span class="sy3">!</span><span class="sy1">=</span> dynamic_extent</span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">source.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> extent</span></span> 均为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 则行为未定义。</li>
|
|
<li>此重载仅若<span class="t-c"><span class="mw-geshi cpp source-cpp">extent <span class="sy1">==</span> std<span class="sy4">::</span><span class="me2">dynamic_extent</span></span></span> 、 <span class="t-c"><span class="mw-geshi cpp source-cpp">N <span class="sy1">==</span> std<span class="sy4">::</span><span class="me2">dynamic_extent</span></span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">N <span class="sy1">==</span> extent</span></span> 至少一者为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 且从 <code>U</code> 到 <span class="t-c"><span class="mw-geshi cpp source-cpp">element_type</span></span> 的转换至多为限定转换才参与重载决议。</li>
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|
</ul>
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|
</div>
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|
<div class="t-li1"><span class="t-li">9)</span> 默认化的赋值构造函数复制大小与数据指针；产生的 span 有 <span class="t-c"><span class="mw-geshi cpp source-cpp">size<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> other.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span></span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">data<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> other.<span class="me1">data</span><span class="br0">(</span><span class="br0">)</span></span></span> 。</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>first</td>
|
|
<td>-</td>
|
|
<td>指向序列首元素的迭代器</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>count</td>
|
|
<td>-</td>
|
|
<td>序列的元素数</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>last</td>
|
|
<td>-</td>
|
|
<td>指向序列末元素后一位置的迭代器或另一哨位</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>arr</td>
|
|
<td>-</td>
|
|
<td>用于构造视图的数组</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>r</td>
|
|
<td>-</td>
|
|
<td>用于构造视图的范围</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>source</td>
|
|
<td>-</td>
|
|
<td>要转换的另一 span</td>
|
|
</tr>
|
|
<tr class="t-par">
|
|
<td>other</td>
|
|
<td>-</td>
|
|
<td>要复制的另一 span</td>
|
|
</tr>
|
|
</table>
|
|
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
|
|
<div class="t-li1"><span class="t-li">2)</span> 不抛出。</div>
|
|
<div class="t-li1"><span class="t-li">3)</span> 在抛出时 <span class="t-c"><span class="mw-geshi cpp source-cpp">last <span class="sy2">-</span> first</span></span> 抛出其所抛出的异常。</div>
|
|
<div class="t-li1"><span class="t-li">7)</span> 在 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">size</span><span class="br0">(</span>r<span class="br0">)</span></span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">data</span><span class="br0">(</span>r<span class="br0">)</span></span></span> 抛出时抛出其所抛出的异常。</div>
|
|
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
|
|
<table class="t-dsc-begin">
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-container-span-data.html"><span class="t-lines"><span>data</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>返回指向元素序列起始的指针<br />
|
|
<span class="t-mark">(公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-container-span-size.html"><span class="t-lines"><span>size</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>返回序列中的元素数<br />
|
|
<span class="t-mark">(公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-container-span-operator=.html"><span class="t-lines"><span>operator=</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>赋值 <code>span</code><br />
|
|
<span class="t-mark">(公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-iterator-size.html"><span class="t-lines"><span>size</span><span>ssize</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>返回容器或数组的大小<br />
|
|
<span class="t-mark">(函数模板)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-iterator-data.html"><span class="t-lines"><span>data</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>获得指向底层数组的指针<br />
|
|
<span class="t-mark">(函数模板)</span></td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
<div class="visualClear"></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</body>
|
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</html>
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