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[SVN r15038]
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Jeremy Siek committed 2002-08-21 16:30:48 +00:00
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using_concept_check.htm
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@@ -64,12 +64,12 @@ instantiate the concept checking class with the type and then find a
way to get the compiler to compile the <tt>constraints()</tt> function
without actually executing the function. The Boost Concept Checking
Library defines two utilities that make this easy:
<tt>function_requires()</tt> and <tt>BOOST_CLASS_REQUIRES</tt>.
<tt>function_requires()</tt> and <tt>BOOST_CLASS_REQUIRE</tt>.
<h4><tt>function_requires()</tt></h4>
The <tt>function_requires()</tt> function can be used in function bodies
and the <tt>BOOST_CLASS_REQUIRES</tt> macro can be used inside class
and the <tt>BOOST_CLASS_REQUIRE</tt> macro can be used inside class
bodies. The <tt>function_requires()</tt> function takes no arguments,
but has a template parameter for the concept checking class. This
means that the instantiated concept checking class must be given as an
@@ -97,9 +97,9 @@ explicit template argument, as shown below.
</pre>
<h4><tt>BOOST_CLASS_REQUIRES</tt></h4>
<h4><tt>BOOST_CLASS_REQUIRE</tt></h4>
The <tt>BOOST_CLASS_REQUIRES</tt> macro can be used inside a class
The <tt>BOOST_CLASS_REQUIRE</tt> macro can be used inside a class
definition to check whether some type models a concept.
<pre>
@@ -107,7 +107,7 @@ definition to check whether some type models a concept.
template &lt;class T&gt;
struct generic_library_class
{
BOOST_CLASS_REQUIRES(T, EqualityComparableConcept);
BOOST_CLASS_REQUIRE(T, boost, EqualityComparableConcept);
// ...
};
@@ -179,7 +179,7 @@ type for the map.
</pre>
As an example of using <tt>BOOST_CLASS_REQUIRES</tt> we look at a concept
As an example of using <tt>BOOST_CLASS_REQUIRE</tt> we look at a concept
check that could be added to <tt>std::vector</tt>. One requirement
that is placed on the element type is that it must be <a
href="http://www.sgi.com/tech/stl/Assignable.html">Assignable</a>.
@@ -191,7 +191,7 @@ of the definition for <tt>std::vector</tt>.
namespace std {
template &lt;class T&gt;
struct vector {
BOOST_CLASS_REQUIRES(T, AssignableConcept);
BOOST_CLASS_REQUIRE(T, boost, AssignableConcept);
...
};
}