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Valarray constructors [C++ Reference]
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<h2><a name="valarray_constructors" id="valarray_constructors">Valarray constructors</a></h2>
<div class="level2">
<p>
Syntax:
</p>
<pre class="c code c++" style="font-family:monospace;"> <span class="co2">#include <valarray></span>
valarray<span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span>
valarray<span class="br0">(</span> size_t num <span class="br0">)</span><span class="sy0">;</span>
valarray<span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy0">&</span> c <span class="br0">)</span><span class="sy0">;</span>
valarray<span class="br0">(</span> <span class="kw4">const</span> TYPE<span class="sy0">&</span> val<span class="sy0">,</span> size_t num <span class="br0">)</span><span class="sy0">;</span>
valarray<span class="br0">(</span> <span class="kw4">const</span> TYPE<span class="sy0">*</span> p<span class="sy0">,</span> size_t num <span class="br0">)</span><span class="sy0">;</span>
valarray<span class="br0">(</span> <span class="kw4">const</span> slice_array<span class="sy0">&</span> c <span class="br0">)</span><span class="sy0">;</span>
valarray<span class="br0">(</span> <span class="kw4">const</span> gslice_array<span class="sy0">&</span> c <span class="br0">)</span><span class="sy0">;</span>
valarray<span class="br0">(</span> <span class="kw4">const</span> mask_array<span class="sy0">&</span> c <span class="br0">)</span><span class="sy0">;</span>
valarray<span class="br0">(</span> <span class="kw4">const</span> indirect_array<span class="sy0">&</span> c <span class="br0">)</span><span class="sy0">;</span>
~valarray<span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span></pre>
<p>
The default valarray constructor takes no arguments, creates a new instance of
that valarray.
</p>
<p>
The second constructor creates a valarray with num uninitialzed elements.
</p>
<p>
The third constructor is a default copy constructor that can be used to create
a new valarray that is a copy of the given valarray c.
</p>
<p>
The fourth constructor creates a valarray with num objects initialized to val. Note that the order of arguments differs from the convention for other standard containers. See the following example for sample usage:
</p>
<pre class="c code c++" style="font-family:monospace;"> valarray<span class="sy0"><</span>int<span class="sy0">></span> v1<span class="br0">(</span> 42<span class="sy0">,</span> 5 <span class="br0">)</span><span class="sy0">;</span> <span class="co1">// creates an array of length 5, all with the value 42</span>
valarray<span class="sy0"><</span>double<span class="sy0">></span> v2<span class="br0">(</span> 1.1<span class="sy0">,</span> 5 <span class="br0">)</span><span class="sy0">;</span> <span class="co1">// creates an array of length 5, all with the value 1.1</span>
valarray<span class="sy0"><</span>double<span class="sy0">></span> v3<span class="br0">(</span> 5<span class="sy0">,</span> 1.1 <span class="br0">)</span><span class="sy0">;</span> <span class="co1">// error - cannot create length of 1.1!</span></pre>
<p>
The fifth constructor creates a valarray or length num and initializes with the values pointed to by the array p.
</p>
<p>
The sixth constructor creates a valarray from the slice provided by c.
</p>
<p>
The seventh constructor creates a valarray from the generalized slice provided by c.
</p>
<p>
The eighth constructor creates a valarray from the mask array provided by c.
</p>
<p>
The last constructor creates a valarray from the indirect array provided by c.
</p>
<p>
The default destructor is called for each element when the valarray is destroyed.
</p>
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