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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>slice_array</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-numeric.html">numeric</a>‎ | <a href="cpp-numeric-valarray.html">valarray</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-valarray.html"><valarray></a></code></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> T <span class="sy1">></span> <span class="kw1">class</span> slice_array<span class="sy4">;</span></span></div>
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<p><code>std::slice_array</code> 是 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-numeric-valarray-slice.html"><span class="kw1474">std::<span class="me2">slice</span></span></a></span></span> 的下标运算符所用的帮助模板。它拥有到 <code>std::slice</code> 对象所指定的数组子集的引用语义。</p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">成员类型</span></h3>
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<td>类型</td>
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<td>定义</td>
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<td><code>value_type</code></td>
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<td><code>T</code></td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><a href="cpp-numeric-valarray-slice_array-slice_array.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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</td>
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<td>构造一个 <code>slice_array</code><br />
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<span class="t-mark">(公开成员函数)</span></td>
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<td>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><a href="cpp-numeric-valarray-slice_array-~slice_array.html"><span class="t-lines"><span>(析构函数)</span></span></a></div>
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</td>
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<td>销毁一个 <code>slice_array</code><br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="cpp-numeric-valarray-slice_array-operator=.html"><span class="t-lines"><span>operator=</span></span></a></div>
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<td>赋值内容<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="cpp-numeric-valarray-slice_array-operator_arith.html"><span class="t-lines"><span>operator+=</span><span>operator-=</span><span>operator*=</span><span>operator/=</span><span>operator%=</span><span>operator&=</span><span>operator|=</span><span>operator^=</span><span>operator<<=</span><span>operator>>=</span></span></a></div>
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</td>
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<td>在切片所指代的数组上进行算术运算。<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <iostream></span>
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<span class="co2">#include <valarray></span>
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<span class="kw1">class</span> Matrix <span class="br0">{</span>
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<span class="kw4">int</span> dim<span class="sy4">;</span>
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<a href="cpp-numeric-valarray.html"><span class="kw1473">std::<span class="me2">valarray</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span> data<span class="sy4">;</span>
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<span class="kw1">public</span><span class="sy4">:</span>
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<span class="kw1">explicit</span> Matrix<span class="br0">(</span><span class="kw4">int</span> dim, <span class="kw4">int</span> init <span class="sy1">=</span> <span class="nu0">0</span><span class="br0">)</span>
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<span class="sy4">:</span> dim<span class="br0">{</span>dim<span class="br0">}</span>, data<span class="br0">(</span>init, dim<span class="sy2">*</span>dim<span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span>
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<span class="kw4">void</span> clear<span class="br0">(</span><span class="kw4">int</span> value <span class="sy1">=</span> <span class="nu0">0</span><span class="br0">)</span> <span class="br0">{</span> data <span class="sy1">=</span> value<span class="sy4">;</span> <span class="br0">}</span>
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<span class="kw4">void</span> identity<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span> clear<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> diagonal<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="nu0">1</span><span class="sy4">;</span> <span class="br0">}</span>
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<span class="kw4">int</span><span class="sy3">&</span> operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span><span class="kw4">int</span> x, <span class="kw4">int</span> y<span class="br0">)</span> <span class="br0">{</span> <span class="kw1">return</span> data<span class="br0">[</span>dim <span class="sy2">*</span> y <span class="sy2">+</span> x<span class="br0">]</span><span class="sy4">;</span> <span class="br0">}</span>
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std<span class="sy4">::</span><span class="me2">slice_array</span><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span> diagonal<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span>
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<span class="kw1">return</span> data<span class="br0">[</span><a href="cpp-numeric-valarray-slice.html"><span class="kw1474">std::<span class="me2">slice</span></span></a><span class="br0">(</span><span class="nu0">0</span>, dim, dim<span class="sy2">+</span><span class="nu0">1</span><span class="br0">)</span><span class="br0">]</span><span class="sy4">;</span>
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<span class="br0">}</span>
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std<span class="sy4">::</span><span class="me2">slice_array</span><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span> secondary_diagonal<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span>
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<span class="kw1">return</span> data<span class="br0">[</span><a href="cpp-numeric-valarray-slice.html"><span class="kw1474">std::<span class="me2">slice</span></span></a><span class="br0">(</span>dim<span class="sy2">-</span><span class="nu0">1</span>, dim, dim<span class="sy2">-</span><span class="nu0">1</span><span class="br0">)</span><span class="br0">]</span><span class="sy4">;</span>
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<span class="br0">}</span>
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std<span class="sy4">::</span><span class="me2">slice_array</span><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span> row<span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> row<span class="br0">)</span> <span class="br0">{</span>
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<span class="kw1">return</span> data<span class="br0">[</span><a href="cpp-numeric-valarray-slice.html"><span class="kw1474">std::<span class="me2">slice</span></span></a><span class="br0">(</span>dim<span class="sy2">*</span>row, dim, <span class="nu0">1</span><span class="br0">)</span><span class="br0">]</span><span class="sy4">;</span>
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<span class="br0">}</span>
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std<span class="sy4">::</span><span class="me2">slice_array</span><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span> column<span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> col<span class="br0">)</span> <span class="br0">{</span>
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<span class="kw1">return</span> data<span class="br0">[</span><a href="cpp-numeric-valarray-slice.html"><span class="kw1474">std::<span class="me2">slice</span></span></a><span class="br0">(</span>col, dim, dim<span class="br0">)</span><span class="br0">]</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw4">void</span> print<span class="br0">(</span><span class="kw4">char</span> term <span class="sy1">=</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span>
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<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">unsigned</span> i <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> i <span class="sy3">!</span><span class="sy1">=</span> data.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="sy2">++</span>i<span class="br0">)</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> data<span class="br0">[</span>i<span class="br0">]</span> <span class="sy1"><<</span> <span class="br0">(</span><span class="br0">(</span><span class="br0">(</span>i<span class="sy2">+</span><span class="nu0">1</span><span class="br0">)</span> <span class="sy2">%</span> dim<span class="br0">)</span> <span class="sy4">?</span> <span class="st0">' '</span> <span class="sy4">:</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> term<span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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Matrix m<span class="br0">{</span><span class="nu0">3</span><span class="br0">}</span><span class="sy4">;</span>
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m.<span class="me1">identity</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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m.<span class="me1">print</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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m.<span class="me1">clear</span><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
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m.<span class="me1">secondary_diagonal</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="nu0">3</span><span class="sy4">;</span>
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m.<span class="me1">print</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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m.<span class="me1">clear</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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m.<span class="me1">row</span><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span> <span class="sy1">=</span> <a href="cpp-numeric-valarray.html"><span class="kw1473">std::<span class="me2">valarray</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span><span class="br0">{</span><span class="nu0">4</span>, <span class="nu0">5</span>, <span class="nu0">6</span><span class="br0">}</span><span class="sy4">;</span>
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m.<span class="me1">print</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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m.<span class="me1">clear</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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m.<span class="me1">column</span><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span> <span class="sy1">=</span> <a href="cpp-numeric-valarray.html"><span class="kw1473">std::<span class="me2">valarray</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span><span class="br0">{</span><span class="nu0">7</span>, <span class="nu0">8</span>, <span class="nu0">9</span><span class="br0">}</span><span class="sy4">;</span>
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m.<span class="me1">print</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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<p>输出：</p>
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<div class="text source-text">
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<pre class="de1">1 0 0
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0 1 0
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0 0 1
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1 1 3
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1 3 1
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3 1 1
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0 0 0
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4 5 6
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0 0 0
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0 7 0
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0 8 0
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0 9 0</pre></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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<div><a href="cpp-numeric-valarray-gslice_array.html"><span class="t-lines"><span>gslice_array</span></span></a></div>
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</div>
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</td>
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<td>valarray 应用 gslice 后的子集的代理<br />
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<span class="t-mark">(类模板)</span></td>
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<div class="visualClear"></div>
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