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<div class="section" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_typetraits.examples"></a> Examples</h3></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="examples.html#boost_typetraits.copy"> An Optimized Version of std::copy</a></span></dt>
<dt><span class="section"><a href="examples.html#boost_typetraits.fill"> An Optimised Version of std::fill</a></span></dt>
<dt><span class="section"><a href="examples.html#boost_typetraits.destruct"> An Example that Omits Destructor Calls For Types with Trivial Destructors</a></span></dt>
<dt><span class="section"><a href="examples.html#boost_typetraits.iter"> An improved Version of std::iter_swap</a></span></dt>
</dl></div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="boost_typetraits.copy"></a> An Optimized Version of std::copy</h4></div></div></div>
<p>
Demonstrates a version of <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">copy</span></code> that uses <code class="computeroutput"><a href="reference.html#boost_typetraits.has_trivial_assign" title=" has_trivial_assign">has_trivial_assign</a></code> to
determine whether to use <code class="computeroutput"><span class="identifier">memcpy</span></code> to optimise the copy operation
(see <a href="../../../libs/type_traits/examples/copy_example.cpp" target="_top">copy_example.cpp</a>):</p>
<pre class="programlisting"><code class="literal"><span class="comment">//
// opt::copy
// same semantics as std::copy
// calls memcpy where appropriate.
//
</span><span class="keyword">
namespace</span><span class="identifier"> detail</span><span class="special">{</span><span class="keyword">
template</span><span class="special"><</span><span class="keyword">typename</span><span class="identifier"> I1</span><span class="special">,</span><span class="keyword"> typename</span><span class="identifier"> I2</span><span class="special">,</span><span class="keyword"> bool</span><span class="identifier"> b</span><span class="special">></span><span class="identifier">
I2</span><span class="identifier"> copy_imp</span><span class="special">(</span><span class="identifier">I1</span><span class="identifier"> first</span><span class="special">,</span><span class="identifier"> I1</span><span class="identifier"> last</span><span class="special">,</span><span class="identifier"> I2</span><span class="identifier"> out</span><span class="special">,</span><span class="keyword"> const</span><span class="identifier"> boost</span><span class="special">::</span><a href="reference.html#boost_typetraits.integral_constant" title=" integral_constant">integral_constant</a><span class="special"><</span><span class="keyword">bool</span><span class="special">,</span><span class="identifier"> b</span><span class="special">>&)</span><span class="special">
{</span><span class="keyword">
while</span><span class="special">(</span><span class="identifier">first</span><span class="special"> !=</span><span class="identifier"> last</span><span class="special">)</span><span class="special">
{</span><span class="special">
*</span><span class="identifier">out</span><span class="special"> =</span><span class="special"> *</span><span class="identifier">first</span><span class="special">;</span><span class="special">
++</span><span class="identifier">out</span><span class="special">;</span><span class="special">
++</span><span class="identifier">first</span><span class="special">;</span><span class="special">
}</span><span class="keyword">
return</span><span class="identifier"> out</span><span class="special">;</span><span class="special">
}</span><span class="keyword">
template</span><span class="special"><</span><span class="keyword">typename</span><span class="identifier"> T</span><span class="special">></span><span class="identifier">
T</span><span class="special">*</span><span class="identifier"> copy_imp</span><span class="special">(</span><span class="keyword">const</span><span class="identifier"> T</span><span class="special">*</span><span class="identifier"> first</span><span class="special">,</span><span class="keyword"> const</span><span class="identifier"> T</span><span class="special">*</span><span class="identifier"> last</span><span class="special">,</span><span class="identifier"> T</span><span class="special">*</span><span class="identifier"> out</span><span class="special">,</span><span class="keyword"> const</span><span class="identifier"> boost</span><span class="special">::</span><a href="reference.html#boost_typetraits.integral_constant" title=" integral_constant">true_type</a><span class="special">&)</span><span class="special">
{</span><span class="identifier">
memcpy</span><span class="special">(</span><span class="identifier">out</span><span class="special">,</span><span class="identifier"> first</span><span class="special">,</span><span class="special"> (</span><span class="identifier">last</span><span class="special">-</span><span class="identifier">first</span><span class="special">)*</span><span class="keyword">sizeof</span><span class="special">(</span><span class="identifier">T</span><span class="special">));</span><span class="keyword">
return</span><span class="identifier"> out</span><span class="special">+(</span><span class="identifier">last</span><span class="special">-</span><span class="identifier">first</span><span class="special">);</span><span class="special">
}</span><span class="special">
}</span><span class="keyword">
template</span><span class="special"><</span><span class="keyword">typename</span><span class="identifier"> I1</span><span class="special">,</span><span class="keyword"> typename</span><span class="identifier"> I2</span><span class="special">></span><span class="keyword">
inline</span><span class="identifier"> I2</span><span class="identifier"> copy</span><span class="special">(</span><span class="identifier">I1</span><span class="identifier"> first</span><span class="special">,</span><span class="identifier"> I1</span><span class="identifier"> last</span><span class="special">,</span><span class="identifier"> I2</span><span class="identifier"> out</span><span class="special">)</span><span class="special">
{</span><span class="comment">
//
// We can copy with memcpy if T has a trivial assignment operator,
// and if the iterator arguments are actually pointers (this last
// requirement we detect with overload resolution):
//
</span><span class="keyword"> typedef</span><span class="keyword"> typename</span><span class="identifier"> std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special"><</span><span class="identifier">I1</span><span class="special">>::</span><span class="identifier">value_type</span><span class="identifier"> value_type</span><span class="special">;</span><span class="keyword">
return</span><span class="identifier"> detail</span><span class="special">::</span><span class="identifier">copy_imp</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span><span class="identifier"> last</span><span class="special">,</span><span class="identifier"> out</span><span class="special">,</span><span class="identifier"> boost</span><span class="special">::</span><a href="reference.html#boost_typetraits.has_trivial_assign" title=" has_trivial_assign">has_trivial_assign</a><span class="special"><</span><span class="identifier">value_type</span><span class="special">>());</span><span class="special">
}</span></code></pre>
</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="boost_typetraits.fill"></a> An Optimised Version of std::fill</h4></div></div></div>
<p>
Demonstrates a version of <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">fill</span></code> that uses <code class="computeroutput"><a href="reference.html#boost_typetraits.has_trivial_assign" title=" has_trivial_assign">has_trivial_assign</a></code> to
determine whether to use <code class="computeroutput"><span class="identifier">memset</span></code> to optimise the fill operation
(see <a href="../../../libs/type_traits/examples/fill_example.cpp" target="_top">fill_example.cpp</a>):</p>
<pre class="programlisting"><code class="literal"><span class="comment">//
// fill
// same as std::fill, but uses memset where appropriate
//
</span><span class="keyword">namespace</span><span class="identifier"> detail</span><span class="special">{</span><span class="keyword">
template</span><span class="special"> <</span><span class="keyword">typename</span><span class="identifier"> I</span><span class="special">,</span><span class="keyword"> typename</span><span class="identifier"> T</span><span class="special">,</span><span class="keyword"> bool</span><span class="identifier"> b</span><span class="special">></span><span class="keyword">
void</span><span class="identifier"> do_fill</span><span class="special">(</span><span class="identifier">I</span><span class="identifier"> first</span><span class="special">,</span><span class="identifier"> I</span><span class="identifier"> last</span><span class="special">,</span><span class="keyword"> const</span><span class="identifier"> T</span><span class="special">&</span><span class="identifier"> val</span><span class="special">,</span><span class="keyword"> const</span><span class="identifier"> boost</span><span class="special">::</span><a href="reference.html#boost_typetraits.integral_constant" title=" integral_constant">integral_constant</a><span class="special"><</span><span class="keyword">bool</span><span class="special">,</span><span class="identifier"> b</span><span class="special">>&)</span><span class="special">
{</span><span class="keyword">
while</span><span class="special">(</span><span class="identifier">first</span><span class="special"> !=</span><span class="identifier"> last</span><span class="special">)</span><span class="special">
{</span><span class="special">
*</span><span class="identifier">first</span><span class="special"> =</span><span class="identifier"> val</span><span class="special">;</span><span class="special">
++</span><span class="identifier">first</span><span class="special">;</span><span class="special">
}</span><span class="special">
}</span><span class="keyword">
template</span><span class="special"> <</span><span class="keyword">typename</span><span class="identifier"> T</span><span class="special">></span><span class="keyword">
void</span><span class="identifier"> do_fill</span><span class="special">(</span><span class="identifier">T</span><span class="special">*</span><span class="identifier"> first</span><span class="special">,</span><span class="identifier"> T</span><span class="special">*</span><span class="identifier"> last</span><span class="special">,</span><span class="keyword"> const</span><span class="identifier"> T</span><span class="special">&</span><span class="identifier"> val</span><span class="special">,</span><span class="keyword"> const</span><span class="identifier"> boost</span><span class="special">::</span><a href="reference.html#boost_typetraits.integral_constant" title=" integral_constant">true_type</a><span class="special">&)</span><span class="special">
{</span><span class="identifier">
std</span><span class="special">::</span><span class="identifier">memset</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span><span class="identifier"> val</span><span class="special">,</span><span class="identifier"> last</span><span class="special">-</span><span class="identifier">first</span><span class="special">);</span><span class="special">
}</span><span class="special">
}</span><span class="keyword">
template</span><span class="special"> <</span><span class="keyword">class</span><span class="identifier"> I</span><span class="special">,</span><span class="keyword"> class</span><span class="identifier"> T</span><span class="special">></span><span class="keyword">
inline</span><span class="keyword"> void</span><span class="identifier"> fill</span><span class="special">(</span><span class="identifier">I</span><span class="identifier"> first</span><span class="special">,</span><span class="identifier"> I</span><span class="identifier"> last</span><span class="special">,</span><span class="keyword"> const</span><span class="identifier"> T</span><span class="special">&</span><span class="identifier"> val</span><span class="special">)</span><span class="special">
{</span><span class="comment">
//
// We can do an optimised fill if T has a trivial assignment
// operator and if it's size is one:
//
</span><span class="keyword"> typedef</span><span class="identifier"> boost</span><span class="special">::</span><a href="reference.html#boost_typetraits.integral_constant" title=" integral_constant">integral_constant</a><span class="special"><</span><span class="keyword">bool</span><span class="special">,</span><span class="special">
::</span><span class="identifier">boost</span><span class="special">::</span><a href="reference.html#boost_typetraits.has_trivial_assign" title=" has_trivial_assign">has_trivial_assign</a><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">value</span><span class="special"> &&</span><span class="special"> (</span><span class="keyword">sizeof</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span><span class="special"> ==</span><span class="number"> 1</span><span class="special">)></span><span class="identifier"> truth_type</span><span class="special">;</span><span class="identifier">
detail</span><span class="special">::</span><span class="identifier">do_fill</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span><span class="identifier"> last</span><span class="special">,</span><span class="identifier"> val</span><span class="special">,</span><span class="identifier"> truth_type</span><span class="special">());</span><span class="special">
}</span></code></pre>
</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="boost_typetraits.destruct"></a> An Example that Omits Destructor Calls For Types with Trivial Destructors</h4></div></div></div>
<p>
Demonstrates a simple algorithm that uses <code class="computeroutput"><span class="identifier">__has_trivial_destruct</span></code> to
determine whether to destructors need to be called
(see <a href="../../../libs/type_traits/examples/trivial_destructor_example.cpp" target="_top">trivial_destructor_example.cpp</a>):</p>
<pre class="programlisting"><code class="literal"><span class="comment">//
// algorithm destroy_array:
// The reverse of std::unitialized_copy, takes a block of
// initialized memory and calls destructors on all objects therein.
//
</span><span class="keyword">
namespace</span><span class="identifier"> detail</span><span class="special">{</span><span class="keyword">
template</span><span class="special"> <</span><span class="keyword">class</span><span class="identifier"> T</span><span class="special">></span><span class="keyword">
void</span><span class="identifier"> do_destroy_array</span><span class="special">(</span><span class="identifier">T</span><span class="special">*</span><span class="identifier"> first</span><span class="special">,</span><span class="identifier"> T</span><span class="special">*</span><span class="identifier"> last</span><span class="special">,</span><span class="keyword"> const</span><span class="identifier"> boost</span><span class="special">::</span><a href="reference.html#boost_typetraits.integral_constant" title=" integral_constant">false_type</a><span class="special">&)</span><span class="special">
{</span><span class="keyword">
while</span><span class="special">(</span><span class="identifier">first</span><span class="special"> !=</span><span class="identifier"> last</span><span class="special">)</span><span class="special">
{</span><span class="identifier">
first</span><span class="special">->~</span><span class="identifier">T</span><span class="special">();</span><span class="special">
++</span><span class="identifier">first</span><span class="special">;</span><span class="special">
}</span><span class="special">
}</span><span class="keyword">
template</span><span class="special"> <</span><span class="keyword">class</span><span class="identifier"> T</span><span class="special">></span><span class="keyword">
inline</span><span class="keyword"> void</span><span class="identifier"> do_destroy_array</span><span class="special">(</span><span class="identifier">T</span><span class="special">*</span><span class="identifier"> first</span><span class="special">,</span><span class="identifier"> T</span><span class="special">*</span><span class="identifier"> last</span><span class="special">,</span><span class="keyword"> const</span><span class="identifier"> boost</span><span class="special">::</span><a href="reference.html#boost_typetraits.integral_constant" title=" integral_constant">true_type</a><span class="special">&)</span><span class="special">
{</span><span class="special">
}</span><span class="special">
}</span><span class="comment"> // namespace detail
</span><span class="keyword">
template</span><span class="special"> <</span><span class="keyword">class</span><span class="identifier"> T</span><span class="special">></span><span class="keyword">
inline</span><span class="keyword"> void</span><span class="identifier"> destroy_array</span><span class="special">(</span><span class="identifier">T</span><span class="special">*</span><span class="identifier"> p1</span><span class="special">,</span><span class="identifier"> T</span><span class="special">*</span><span class="identifier"> p2</span><span class="special">)</span><span class="special">
{</span><span class="identifier">
detail</span><span class="special">::</span><span class="identifier">do_destroy_array</span><span class="special">(</span><span class="identifier">p1</span><span class="special">,</span><span class="identifier"> p2</span><span class="special">,</span><span class="special"> ::</span><span class="identifier">boost</span><span class="special">::</span><a href="reference.html#boost_typetraits.has_trivial_destructor" title=" has_trivial_destructor">has_trivial_destructor</a><span class="special"><</span><span class="identifier">T</span><span class="special">>());</span><span class="special">
}</span></code></pre>
</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="boost_typetraits.iter"></a> An improved Version of std::iter_swap</h4></div></div></div>
<p>
Demonstrates a version of <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">iter_swap</span></code> that use type traits to
determine whether an it's arguments are proxying iterators or not,
if they're not then it just does a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">swap</span></code> of it's dereferenced
arguments (the
same as <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">iter_swap</span></code> does), however if they are proxying iterators
then takes special care over the swap to ensure that the algorithm
works correctly for both proxying iterators, and even iterators of
different types
(see <a href="../../../libs/type_traits/examples/iter_swap_example.cpp" target="_top">iter_swap_example.cpp</a>):</p>
<pre class="programlisting"><code class="literal"><span class="comment">//
// iter_swap:
// tests whether iterator is a proxying iterator or not, and
// uses optimal form accordingly:
//
</span><span class="keyword">namespace</span><span class="identifier"> detail</span><span class="special">{</span><span class="keyword">
template</span><span class="special"> <</span><span class="keyword">typename</span><span class="identifier"> I</span><span class="special">></span><span class="keyword">
static</span><span class="keyword"> void</span><span class="identifier"> do_swap</span><span class="special">(</span><span class="identifier">I</span><span class="identifier"> one</span><span class="special">,</span><span class="identifier"> I</span><span class="identifier"> two</span><span class="special">,</span><span class="keyword"> const</span><span class="identifier"> boost</span><span class="special">::</span><a href="reference.html#boost_typetraits.integral_constant" title=" integral_constant">false_type</a><span class="special">&)</span><span class="special">
{</span><span class="keyword">
typedef</span><span class="keyword"> typename</span><span class="identifier"> std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special"><</span><span class="identifier">I</span><span class="special">>::</span><span class="identifier">value_type</span><span class="identifier"> v_t</span><span class="special">;</span><span class="identifier">
v_t</span><span class="identifier"> v</span><span class="special"> =</span><span class="special"> *</span><span class="identifier">one</span><span class="special">;</span><span class="special">
*</span><span class="identifier">one</span><span class="special"> =</span><span class="special"> *</span><span class="identifier">two</span><span class="special">;</span><span class="special">
*</span><span class="identifier">two</span><span class="special"> =</span><span class="identifier"> v</span><span class="special">;</span><span class="special">
}</span><span class="keyword">
template</span><span class="special"> <</span><span class="keyword">typename</span><span class="identifier"> I</span><span class="special">></span><span class="keyword">
static</span><span class="keyword"> void</span><span class="identifier"> do_swap</span><span class="special">(</span><span class="identifier">I</span><span class="identifier"> one</span><span class="special">,</span><span class="identifier"> I</span><span class="identifier"> two</span><span class="special">,</span><span class="keyword"> const</span><span class="identifier"> boost</span><span class="special">::</span><a href="reference.html#boost_typetraits.integral_constant" title=" integral_constant">true_type</a><span class="special">&)</span><span class="special">
{</span><span class="keyword">
using</span><span class="identifier"> std</span><span class="special">::</span><span class="identifier">swap</span><span class="special">;</span><span class="identifier">
swap</span><span class="special">(*</span><span class="identifier">one</span><span class="special">,</span><span class="special"> *</span><span class="identifier">two</span><span class="special">);</span><span class="special">
}</span><span class="special">
}</span><span class="keyword">
template</span><span class="special"> <</span><span class="keyword">typename</span><span class="identifier"> I1</span><span class="special">,</span><span class="keyword"> typename</span><span class="identifier"> I2</span><span class="special">></span><span class="keyword">
inline</span><span class="keyword"> void</span><span class="identifier"> iter_swap</span><span class="special">(</span><span class="identifier">I1</span><span class="identifier"> one</span><span class="special">,</span><span class="identifier"> I2</span><span class="identifier"> two</span><span class="special">)</span><span class="special">
{</span><span class="comment">
//
// See is both arguments are non-proxying iterators,
// and if both iterator the same type:
//
</span><span class="keyword"> typedef</span><span class="keyword"> typename</span><span class="identifier"> std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special"><</span><span class="identifier">I1</span><span class="special">>::</span><span class="identifier">reference</span><span class="identifier"> r1_t</span><span class="special">;</span><span class="keyword">
typedef</span><span class="keyword"> typename</span><span class="identifier"> std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special"><</span><span class="identifier">I2</span><span class="special">>::</span><span class="identifier">reference</span><span class="identifier"> r2_t</span><span class="special">;</span><span class="keyword">
typedef</span><span class="identifier"> boost</span><span class="special">::</span><a href="reference.html#boost_typetraits.integral_constant" title=" integral_constant">integral_constant</a><span class="special"><</span><span class="keyword">bool</span><span class="special">,</span><span class="special">
::</span><span class="identifier">boost</span><span class="special">::</span><a href="reference.html#boost_typetraits.is_reference" title=" is_reference">is_reference</a><span class="special"><</span><span class="identifier">r1_t</span><span class="special">>::</span><span class="identifier">value</span><span class="special">
&&</span><span class="special"> ::</span><span class="identifier">boost</span><span class="special">::</span><a href="reference.html#boost_typetraits.is_reference" title=" is_reference">is_reference</a><span class="special"><</span><span class="identifier">r2_t</span><span class="special">>::</span><span class="identifier">value</span><span class="special">
&&</span><span class="special"> ::</span><span class="identifier">boost</span><span class="special">::</span><a href="reference.html#boost_typetraits.is_same" title=" is_same">is_same</a><span class="special"><</span><span class="identifier">r1_t</span><span class="special">,</span><span class="identifier"> r2_t</span><span class="special">>::</span><span class="identifier">value</span><span class="special">></span><span class="identifier"> truth_type</span><span class="special">;</span><span class="identifier">
detail</span><span class="special">::</span><span class="identifier">do_swap</span><span class="special">(</span><span class="identifier">one</span><span class="special">,</span><span class="identifier"> two</span><span class="special">,</span><span class="identifier"> truth_type</span><span class="special">());</span><span class="special">
}</span></code></pre>
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<td align="right"><small>Copyright © 2000, 2005 Adobe Systems Inc, David Abrahams, Steve Cleary,
Beman Dawes, Aleksey Gurtovoy, Howard Hinnant, Jesse Jones, Mat Marcus,
Itay Maman, John Maddock, Thorsten Ottosen, Robert Ramey and Jeremy Siek</small></td>
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