#ifndef BOOST_CLBL_TRTS_DETAIL_FORWARD_DECLARATIONS
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#define BOOST_CLBL_TRTS_DETAIL_FORWARD_DECLARATIONS
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#include <boost/callable_traits/detail/config.hpp>
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#include <boost/callable_traits/detail/default_callable_traits.hpp>
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namespace boost { namespace callable_traits { namespace detail {
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template<typename T>
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struct function;
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template<typename T>
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struct has_normal_call_operator
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{
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template<typename N, N Value>
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struct check { check(std::nullptr_t) {} };
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template<typename U>
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static std::int8_t test(
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check<decltype(&U::operator()), &U::operator()>);
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template<typename>
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static std::int16_t test(...);
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static constexpr bool value =
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sizeof(test<T>(nullptr)) == sizeof(std::int8_t);
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};
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struct callable_dummy {
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void operator()() {}
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};
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template<typename T>
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using default_to_function_object = typename std::conditional<
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has_normal_call_operator<T>::value,
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T, callable_dummy>::type;
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template<typename T>
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struct pmf;
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template<typename T>
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struct pmd;
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template<typename F, typename T = typename std::remove_reference<F>::type>
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using function_object_base = typename std::conditional<
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has_normal_call_operator<T>::value,
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pmf<decltype(&default_to_function_object<T>::operator())>,
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default_callable_traits<T>>::type;
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template<typename T, typename Base = function_object_base<T>>
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struct function_object;
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}}} // namespace boost::callable_traits::detail
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#endif // #ifndef BOOST_CLBL_TRTS_DETAIL_FORWARD_DECLARATIONS
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