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< title > The MPL Reference Manual: BOOST_MPL_ASSERT_RELATION< / title >
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< td class = "header-group page-location" > < a href = "../refmanual.html" class = "navigation-link" > Front Page< / a > / < a href = "./macros.html" class = "navigation-link" > Macros< / a > / < a href = "./asserts.html" class = "navigation-link" > Asserts< / a > / < a href = "./assert-relation.html" class = "navigation-link" > BOOST_MPL_ASSERT_RELATION< / a > < / td >
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< div class = "section" id = "boost-mpl-assert-relation" >
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< h1 > < a class = "toc-backref" href = "./asserts.html#id1591" > BOOST_MPL_ASSERT_RELATION< / a > < / h1 >
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< div class = "section" id = "id1308" >
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< h3 > < a class = "subsection-title" href = "#synopsis" name = "synopsis" > Synopsis< / a > < / h3 >
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#define < a href = "./assert-relation.html" class = "identifier" > BOOST_MPL_ASSERT_RELATION< / a > ( x, relation, y ) \
< em > unspecified token sequence< / em > \
/**/
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< h3 > < a class = "subsection-title" href = "#description" name = "description" > Description< / a > < / h3 >
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< p > A specialized assertion macro for checking numerical conditions. Generates
a compilation error when the condition < tt class = "literal" > < span class = "pre" > (< / span > < span class = "pre" > x< / span > < span class = "pre" > relation< / span > < span class = "pre" > y< / span > < span class = "pre" > )< / span > < / tt >
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doesn't hold.< / p >
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< h3 > < a class = "subsection-title" href = "#header" name = "header" > Header< / a > < / h3 >
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#include < < a href = "../../../../boost/mpl/assert.hpp" class = "header" > boost/mpl/assert.hpp< / a > >
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< h3 > < a class = "subsection-title" href = "#parameters" name = "parameters" > Parameters< / a > < / h3 >
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< tr > < th class = "head" > Parameter< / th >
< th class = "head" > Requirement< / th >
< th class = "head" > Description< / th >
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< tr > < td > < tt class = "literal" > < span class = "pre" > x< / span > < / tt > < / td >
< td > An integral constant< / td >
< td > Left operand of the checked relation.< / td >
< / tr >
< tr > < td > < tt class = "literal" > < span class = "pre" > y< / span > < / tt > < / td >
< td > An integral constant< / td >
< td > Right operand of the checked relation.< / td >
< / tr >
< tr > < td > < tt class = "literal" > < span class = "pre" > relation< / span > < / tt > < / td >
< td > A C++ operator token< / td >
< td > An operator token for the relation being
checked.< / td >
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< h3 > < a class = "subsection-title" href = "#expression-semantics" name = "expression-semantics" > Expression semantics< / a > < / h3 >
< p > For any integral constants < tt class = "literal" > < span class = "pre" > x< / span > < / tt > , < tt class = "literal" > < span class = "pre" > y< / span > < / tt > and a legal C++ operator token < tt class = "literal" > < span class = "pre" > op< / span > < / tt > :< / p >
< pre class = "literal-block" >
< a href = "./assert-relation.html" class = "identifier" > BOOST_MPL_ASSERT_RELATION< / a > ( x, op, y );
< / pre >
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< table class = "docutils field-list" frame = "void" rules = "none" >
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< col class = "field-name" / >
< col class = "field-body" / >
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< tr class = "field" > < th class = "field-name" > Return type:< / th > < td class = "field-body" > < p class = "first" > None.< / p >
< / td >
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< / tr >
< tr class = "field" > < th class = "field-name" > Semantics:< / th > < td class = "field-body" > < p class = "first" > Generates a compilation error if < tt class = "literal" > < span class = "pre" > (< / span > < span class = "pre" > x< / span > < span class = "pre" > op< / span > < span class = "pre" > y< / span > < span class = "pre" > )< / span > < span class = "pre" > !=< / span > < span class = "pre" > true< / span > < / tt > , otherwise
has no effect.< / p >
< p > When possible within the compiler's diagnostic capabilities,
the error message will include a name of the relation being checked,
the actual values of both operands, and have a general form of:< / p >
< pre class = "last literal-block" >
< em > ...< / em > ************< em > ...< / em > assert_relation< op, x, y> ::************) < em > ...< / em >
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< h3 > < a class = "subsection-title" href = "#example" name = "example" > Example< / a > < / h3 >
< pre class = "literal-block" >
template< typename T, typename U > struct my
{
// ...
< a href = "./assert-relation.html" class = "identifier" > BOOST_MPL_ASSERT_RELATION< / a > ( sizeof(T), < , sizeof(U) );
};
my< char[50],char[10]> test;
// In instantiation of `my< char[50], char[10]> ':
// instantiated from here
// conversion from `
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// mpl_::failed************mpl_::assert_relation< < a href = "./less.html" class = "identifier" > less< / a > , 50, 10> ::************'
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// to non-scalar type `mpl_::assert< false> ' requested
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< h3 > < a class = "subsection-title" href = "#see-also" name = "see-also" > See also< / a > < / h3 >
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< p > < a class = "reference internal" href = "./asserts.html" > Asserts< / a > , < a class = "reference internal" href = "./assert.html" > BOOST_MPL_ASSERT< / a > , < a class = "reference internal" href = "./assert-not.html" > BOOST_MPL_ASSERT_NOT< / a > , < a class = "reference internal" href = "./assert-msg.html" > BOOST_MPL_ASSERT_MSG< / a > < / p >
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< td > < div class = "copyright-footer" > < div class = "copyright" > Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams< / div >
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