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Diffstat (limited to '3rdParty/Boost/src/boost/tti/has_type.hpp')
-rw-r--r-- | 3rdParty/Boost/src/boost/tti/has_type.hpp | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/tti/has_type.hpp b/3rdParty/Boost/src/boost/tti/has_type.hpp new file mode 100644 index 0000000..cf413e5 --- /dev/null +++ b/3rdParty/Boost/src/boost/tti/has_type.hpp @@ -0,0 +1,165 @@ + +// (C) Copyright Edward Diener 2011,2012,2013 +// Use, modification and distribution are subject to the Boost Software License, +// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at +// http://www.boost.org/LICENSE_1_0.txt). + +#if !defined(BOOST_TTI_HAS_TYPE_HPP) +#define BOOST_TTI_HAS_TYPE_HPP + +#include <boost/config.hpp> +#include <boost/preprocessor/cat.hpp> +#include <boost/tti/gen/has_type_gen.hpp> +#include <boost/tti/gen/namespace_gen.hpp> +#include <boost/tti/detail/dtype.hpp> +#include <boost/tti/detail/ddeftype.hpp> + +/* + + The succeeding comments in this file are in doxygen format. + +*/ + +/** \file +*/ + +/** + + BOOST_TTI_TRAIT_HAS_TYPE is a macro which expands to a metafunction. + The metafunction tests whether an inner type with a particular name exists + and, optionally, whether a lambda expression invoked with the inner type + is true or not. + + trait = the name of the metafunction within the tti namespace. + + name = the name of the inner type. + + generates a metafunction called "trait" where 'trait' is the macro parameter. + + template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_U> + struct trait + { + static const value = unspecified; + typedef mpl::bool_<true-or-false> type; + }; + + The metafunction types and return: + + BOOST_TTI_TP_T = the enclosing type in which to look for our 'name'. + + BOOST_TTI_TP_U = (optional) An optional template parameter, defaulting to a marker type. + If specified it is an MPL lambda expression which is invoked + with the inner type found and must return a constant boolean + value. + + returns = 'value' depends on whether or not the optional BOOST_TTI_TP_U is specified. + + If BOOST_TTI_TP_U is not specified, then 'value' is true if the 'name' type + exists within the enclosing type BOOST_TTI_TP_T; otherwise 'value' is false. + + If BOOST_TTI_TP_U is specified , then 'value' is true if the 'name' type exists + within the enclosing type BOOST_TTI_TP_T and the lambda expression as specified + by BOOST_TTI_TP_U, invoked by passing the actual inner type of 'name', returns + a 'value' of true; otherwise 'value' is false. + + The action taken with BOOST_TTI_TP_U occurs only when the 'name' type exists + within the enclosing type BOOST_TTI_TP_T. + + Example usage: + + BOOST_TTI_TRAIT_HAS_TYPE(LookFor,MyType) generates the metafunction LookFor in the current scope + to look for an inner type called MyType. + + LookFor<EnclosingType>::value is true if MyType is an inner type of EnclosingType, otherwise false. + + LookFor<EnclosingType,ALambdaExpression>::value is true if MyType is an inner type of EnclosingType + and invoking ALambdaExpression with the inner type returns a value of true, otherwise false. + + A popular use of the optional MPL lambda expression is to check whether the type found is the same + as another type, when the type found is a typedef. In that case our example would be: + + LookFor<EnclosingType,boost::is_same<_,SomeOtherType> >::value is true if MyType is an inner type + of EnclosingType and is the same type as SomeOtherType. + +*/ +#define BOOST_TTI_TRAIT_HAS_TYPE(trait,name) \ + BOOST_TTI_DETAIL_TRAIT_HAS_TYPE(trait,name) \ + template \ + < \ + class BOOST_TTI_TP_T, \ + class BOOST_TTI_TP_U = BOOST_TTI_NAMESPACE::detail::deftype \ + > \ + struct trait \ + { \ + typedef typename \ + BOOST_PP_CAT(trait,_detail_type)<BOOST_TTI_TP_T,BOOST_TTI_TP_U>::type type; \ + BOOST_STATIC_CONSTANT(bool,value=type::value); \ + }; \ +/**/ + +/** + + BOOST_TTI_HAS_TYPE is a macro which expands to a metafunction. + The metafunction tests whether an inner type with a particular name exists + and, optionally, whether a lambda expression invoked with the inner type + is true or not. + + name = the name of the inner type. + + generates a metafunction called "has_type_'name'" where 'name' is the macro parameter. + + template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_U> + struct has_type_'name' + { + static const value = unspecified; + typedef mpl::bool_<true-or-false> type; + }; + + The metafunction types and return: + + BOOST_TTI_TP_T = the enclosing type in which to look for our 'name'. + + BOOST_TTI_TP_U = (optional) An optional template parameter, defaulting to a marker type. + If specified it is an MPL lambda expression which is invoked + with the inner type found and must return a constant boolean + value. + + returns = 'value' depends on whether or not the optional BOOST_TTI_TP_U is specified. + + If BOOST_TTI_TP_U is not specified, then 'value' is true if the 'name' type + exists within the enclosing type BOOST_TTI_TP_T; otherwise 'value' is false. + + If BOOST_TTI_TP_U is specified , then 'value' is true if the 'name' type exists + within the enclosing type BOOST_TTI_TP_T and the lambda expression as specified + by BOOST_TTI_TP_U, invoked by passing the actual inner type of 'name', returns + a 'value' of true; otherwise 'value' is false. + + The action taken with BOOST_TTI_TP_U occurs only when the 'name' type exists + within the enclosing type BOOST_TTI_TP_T. + + Example usage: + + BOOST_TTI_HAS_TYPE(MyType) generates the metafunction has_type_MyType in the current scope + to look for an inner type called MyType. + + has_type_MyType<EnclosingType>::value is true if MyType is an inner type of EnclosingType, otherwise false. + + has_type_MyType<EnclosingType,ALambdaExpression>::value is true if MyType is an inner type of EnclosingType + and invoking ALambdaExpression with the inner type returns a value of true, otherwise false. + + A popular use of the optional MPL lambda expression is to check whether the type found is the same + as another type, when the type found is a typedef. In that case our example would be: + + has_type_MyType<EnclosingType,boost::is_same<_,SomeOtherType> >::value is true if MyType is an inner type + of EnclosingType and is the same type as SomeOtherType. + +*/ +#define BOOST_TTI_HAS_TYPE(name) \ + BOOST_TTI_TRAIT_HAS_TYPE \ + ( \ + BOOST_TTI_HAS_TYPE_GEN(name), \ + name \ + ) \ +/**/ + +#endif // BOOST_TTI_HAS_TYPE_HPP |