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Valarray operators [C++ Reference]
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<h2><a name="valarray_operators" id="valarray_operators">Valarray operators</a></h2>
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<p>
Syntax:
</p>
<pre class="c code c++" style="font-family:monospace;"> <span class="co2">#include <valarray></span>
valarray<span class="sy0">&</span> operator<span class="sy0">=</span><span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy0">&</span> v <span class="br0">)</span><span class="sy0">;</span> <span class="co1">// copy v</span>
valarray<span class="sy0">&</span> operator<span class="sy0">=</span><span class="br0">(</span> <span class="kw4">const</span> T<span class="sy0">&</span> val <span class="br0">)</span><span class="sy0">;</span> <span class="co1">// assign val to every element</span>
TYPE operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> size_t index <span class="br0">)</span> <span class="kw4">const</span><span class="sy0">;</span>
TYPE<span class="sy0">&</span> operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> size_t index <span class="br0">)</span><span class="sy0">;</span>
valarray operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> slice s <span class="br0">)</span> <span class="kw4">const</span><span class="sy0">;</span>
slice_array<span class="sy0"><</span>TYPE<span class="sy0">></span> operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> slice s <span class="br0">)</span><span class="sy0">;</span>
valarray operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> <span class="kw4">const</span> gslice<span class="sy0">&</span> s <span class="br0">)</span> <span class="kw4">const</span><span class="sy0">;</span>
gslice_array<span class="sy0"><</span>TYPE<span class="sy0">></span> operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> <span class="kw4">const</span> gslice<span class="sy0">&</span> s <span class="br0">)</span><span class="sy0">;</span>
valarray operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy0"><</span>bool<span class="sy0">>&</span> mask <span class="br0">)</span> <span class="kw4">const</span><span class="sy0">;</span>
mask_array<span class="sy0"><</span>TYPE<span class="sy0">></span> operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy0"><</span>bool<span class="sy0">>&</span> mask <span class="br0">)</span><span class="sy0">;</span>
valarray operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy0"><</span>size_t<span class="sy0">>&</span> indirect <span class="br0">)</span> <span class="kw4">const</span><span class="sy0">;</span>
indirect_array<span class="sy0"><</span>TYPE<span class="sy0">></span> operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy0"><</span>size_t<span class="sy0">>&</span> indirect <span class="br0">)</span><span class="sy0">;</span>
valarray<span class="sy0">&</span> operator<span class="sy0">=</span><span class="br0">(</span> <span class="kw4">const</span> slice_array<span class="sy0">&</span> s <span class="br0">)</span><span class="sy0">;</span>
valarray<span class="sy0">&</span> operator<span class="sy0">=</span><span class="br0">(</span> <span class="kw4">const</span> gslice_array<span class="sy0">&</span> g <span class="br0">)</span><span class="sy0">;</span>
valarray<span class="sy0">&</span> operator<span class="sy0">=</span><span class="br0">(</span> <span class="kw4">const</span> mask_array<span class="sy0">&</span> mask <span class="br0">)</span><span class="sy0">;</span>
valarray<span class="sy0">&</span> operator<span class="sy0">=</span><span class="br0">(</span> <span class="kw4">const</span> indirect_array<span class="sy0">&</span> i <span class="br0">)</span><span class="sy0">;</span></pre>
<p>
A valarray can be assigned to another of the same size. The assignment operator will copied each element from one array to the other as expected. However, if the arrays are of different sizes, the result is undefined. It is unwise to expect any errors or exception handling to occur because of mismatched array sizes or exceeding bounds of the valarray. Valarrays are optimized for speed and their implementation is machine and compiler specific.
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