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211 lines
6.5 KiB
C++
211 lines
6.5 KiB
C++
// Boost result_of library
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// Copyright Douglas Gregor 2004. Use, modification and
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// distribution is subject to the Boost Software License, Version
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// For more information, see http://www.boost.org/libs/utility
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#ifndef BOOST_RESULT_OF_HPP
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#define BOOST_RESULT_OF_HPP
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#include <boost/config.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/iteration/iterate.hpp>
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
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#include <boost/preprocessor/repetition/enum_binary_params.hpp>
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#include <boost/preprocessor/repetition/enum_shifted_params.hpp>
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#include <boost/preprocessor/facilities/intercept.hpp>
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#include <boost/detail/workaround.hpp>
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#include <boost/mpl/has_xxx.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/eval_if.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/identity.hpp>
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#include <boost/mpl/or.hpp>
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#include <boost/type_traits/is_class.hpp>
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#include <boost/type_traits/is_pointer.hpp>
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#include <boost/type_traits/is_member_function_pointer.hpp>
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#include <boost/type_traits/remove_cv.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/utility/declval.hpp>
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#include <boost/utility/enable_if.hpp>
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#ifndef BOOST_RESULT_OF_NUM_ARGS
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# define BOOST_RESULT_OF_NUM_ARGS 16
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#endif
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// Use the decltype-based version of result_of by default if the compiler
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// supports N3276 <http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2011/n3276.pdf>.
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// The user can force the choice by defining BOOST_RESULT_OF_USE_DECLTYPE,
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// BOOST_RESULT_OF_USE_TR1, or BOOST_RESULT_OF_USE_TR1_WITH_DECLTYPE_FALLBACK but not more than one!
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#if (defined(BOOST_RESULT_OF_USE_DECLTYPE) && defined(BOOST_RESULT_OF_USE_TR1)) || \
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(defined(BOOST_RESULT_OF_USE_DECLTYPE) && defined(BOOST_RESULT_OF_USE_TR1_WITH_DECLTYPE_FALLBACK)) || \
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(defined(BOOST_RESULT_OF_USE_TR1) && defined(BOOST_RESULT_OF_USE_TR1_WITH_DECLTYPE_FALLBACK))
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# error More than one of BOOST_RESULT_OF_USE_DECLTYPE, BOOST_RESULT_OF_USE_TR1 and \
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BOOST_RESULT_OF_USE_TR1_WITH_DECLTYPE_FALLBACK cannot be defined at the same time.
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#endif
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#if defined(BOOST_RESULT_OF_USE_TR1_WITH_DECLTYPE_FALLBACK) && defined(BOOST_MPL_CFG_NO_HAS_XXX_TEMPLATE)
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# error Cannot fallback to decltype if BOOST_MPL_CFG_NO_HAS_XXX_TEMPLATE is not defined.
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#endif
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#ifndef BOOST_RESULT_OF_USE_TR1
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# ifndef BOOST_RESULT_OF_USE_DECLTYPE
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# ifndef BOOST_RESULT_OF_USE_TR1_WITH_DECLTYPE_FALLBACK
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# ifndef BOOST_NO_CXX11_DECLTYPE_N3276 // this implies !defined(BOOST_NO_CXX11_DECLTYPE)
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# define BOOST_RESULT_OF_USE_DECLTYPE
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# else
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# define BOOST_RESULT_OF_USE_TR1
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# endif
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# endif
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# endif
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#endif
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namespace boost {
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template<typename F> struct result_of;
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template<typename F> struct tr1_result_of; // a TR1-style implementation of result_of
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#if !defined(BOOST_NO_SFINAE)
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namespace detail {
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BOOST_MPL_HAS_XXX_TRAIT_DEF(result_type)
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// Work around a nvcc bug by only defining has_result when it's needed.
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#ifdef BOOST_RESULT_OF_USE_TR1_WITH_DECLTYPE_FALLBACK
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BOOST_MPL_HAS_XXX_TEMPLATE_DEF(result)
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#endif
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template<typename F, typename FArgs, bool HasResultType> struct tr1_result_of_impl;
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template<typename F> struct cpp0x_result_of;
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#ifdef BOOST_NO_SFINAE_EXPR
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// There doesn't seem to be any other way to turn this off such that the presence of
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// the user-defined operator,() below doesn't cause spurious warning all over the place,
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// so unconditionally turn it off.
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#if BOOST_MSVC
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# pragma warning(disable: 4913) // user defined binary operator ',' exists but no overload could convert all operands, default built-in binary operator ',' used
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#endif
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struct result_of_private_type {};
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struct result_of_weird_type {
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friend result_of_private_type operator,(result_of_private_type, result_of_weird_type);
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};
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typedef char result_of_yes_type; // sizeof(result_of_yes_type) == 1
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typedef char (&result_of_no_type)[2]; // sizeof(result_of_no_type) == 2
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template<typename T>
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result_of_no_type result_of_is_private_type(T const &);
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result_of_yes_type result_of_is_private_type(result_of_private_type);
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template<typename C>
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struct result_of_callable_class : C {
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result_of_callable_class();
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typedef result_of_private_type const &(*pfn_t)(...);
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operator pfn_t() const volatile;
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};
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template<typename C>
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struct result_of_wrap_callable_class {
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typedef result_of_callable_class<C> type;
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};
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template<typename C>
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struct result_of_wrap_callable_class<C const> {
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typedef result_of_callable_class<C> const type;
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};
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template<typename C>
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struct result_of_wrap_callable_class<C volatile> {
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typedef result_of_callable_class<C> volatile type;
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};
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template<typename C>
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struct result_of_wrap_callable_class<C const volatile> {
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typedef result_of_callable_class<C> const volatile type;
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};
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template<typename C>
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struct result_of_wrap_callable_class<C &> {
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typedef typename result_of_wrap_callable_class<C>::type &type;
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};
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template<typename F, bool TestCallability = true> struct cpp0x_result_of_impl;
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#else // BOOST_NO_SFINAE_EXPR
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template<typename T>
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struct result_of_always_void
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{
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typedef void type;
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};
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template<typename F, typename Enable = void> struct cpp0x_result_of_impl {};
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#endif // BOOST_NO_SFINAE_EXPR
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template<typename F>
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struct result_of_void_impl
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{
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typedef void type;
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};
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template<typename R>
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struct result_of_void_impl<R (*)(void)>
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{
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typedef R type;
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};
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template<typename R>
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struct result_of_void_impl<R (&)(void)>
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{
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typedef R type;
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};
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// Determine the return type of a function pointer or pointer to member.
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template<typename F, typename FArgs>
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struct result_of_pointer
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: tr1_result_of_impl<typename remove_cv<F>::type, FArgs, false> { };
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template<typename F, typename FArgs>
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struct tr1_result_of_impl<F, FArgs, true>
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{
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typedef typename F::result_type type;
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};
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template<typename FArgs>
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struct is_function_with_no_args : mpl::false_ {};
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template<typename F>
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struct is_function_with_no_args<F(void)> : mpl::true_ {};
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template<typename F, typename FArgs>
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struct result_of_nested_result : F::template result<FArgs>
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{};
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template<typename F, typename FArgs>
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struct tr1_result_of_impl<F, FArgs, false>
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: mpl::if_<is_function_with_no_args<FArgs>,
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result_of_void_impl<F>,
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result_of_nested_result<F, FArgs> >::type
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{};
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} // end namespace detail
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#define BOOST_PP_ITERATION_PARAMS_1 (3,(0,BOOST_RESULT_OF_NUM_ARGS,<boost/utility/detail/result_of_iterate.hpp>))
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#include BOOST_PP_ITERATE()
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#else
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# define BOOST_NO_RESULT_OF 1
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#endif
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}
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#endif // BOOST_RESULT_OF_HPP
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