mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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210 lines
7.1 KiB
C++
210 lines
7.1 KiB
C++
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#ifndef SPROUT_GENERATOR_GENERATED_VALUE_HPP
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#define SPROUT_GENERATOR_GENERATED_VALUE_HPP
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#include <utility>
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#include <type_traits>
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#include <sprout/utility/forward.hpp>
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#include <sprout/type_traits/enabler_if.hpp>
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#include <sprout/tuple/tuple/get.hpp>
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namespace sprout_generator_detail {
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struct not_found_adl_generated_value {};
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sprout_generator_detail::not_found_adl_generated_value generated_value(...);
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template<typename T>
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struct has_mem_generated_value_test {
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public:
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template<
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typename U = T,
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typename = decltype(std::declval<U>().generated_value())
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>
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static std::true_type test(int);
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static std::false_type test(...);
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};
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template<typename T>
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struct has_mem_generated_value
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: public decltype(sprout_generator_detail::has_mem_generated_value_test<T>::test(0))
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{};
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template<typename T>
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struct has_adl_generated_value_test {
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public:
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template<
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typename U = T,
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typename sprout::enabler_if<
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!std::is_same<decltype(generated_value(std::declval<U>())), sprout_generator_detail::not_found_adl_generated_value>::value
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>::type = sprout::enabler
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>
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static std::true_type test(int);
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static std::false_type test(...);
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};
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template<typename T>
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struct has_adl_generated_value
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: public decltype(sprout_generator_detail::has_adl_generated_value_test<T>::test(0))
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{};
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template<typename T>
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struct has_tuple_get_generated_value_test {
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public:
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template<
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typename U = T,
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typename = decltype(sprout::tuples::get<0>(std::declval<U>()))
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>
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static std::true_type test(int);
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static std::false_type test(...);
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};
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template<typename T>
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struct has_tuple_get_generated_value
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: public decltype(sprout_generator_detail::has_tuple_get_generated_value_test<T>::test(0))
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{};
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template<typename T, typename Enable = void>
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struct select_mem_generated_value;
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template<typename T>
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struct select_mem_generated_value<
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T,
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typename std::enable_if<sprout_generator_detail::has_mem_generated_value<T>::value>::type
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>
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: public std::true_type
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{};
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template<typename T>
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struct select_mem_generated_value<
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T,
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typename std::enable_if<!sprout_generator_detail::has_mem_generated_value<T>::value>::type
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>
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: public std::false_type
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{};
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template<typename T, typename Enable = void>
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struct select_adl_generated_value;
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template<typename T>
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struct select_adl_generated_value<
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T,
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typename std::enable_if<
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sprout_generator_detail::has_adl_generated_value<T>::value
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&& !sprout_generator_detail::has_mem_generated_value<T>::value
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>::type
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>
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: public std::true_type
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{};
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template<typename T>
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struct select_adl_generated_value<
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T,
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typename std::enable_if<!(
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sprout_generator_detail::has_adl_generated_value<T>::value
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&& !sprout_generator_detail::has_mem_generated_value<T>::value
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)>::type
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>
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: public std::false_type
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{};
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template<typename T, typename Enable = void>
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struct select_tuple_get_generated_value;
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template<typename T>
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struct select_tuple_get_generated_value<
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T,
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typename std::enable_if<
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sprout_generator_detail::has_tuple_get_generated_value<T>::value
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&& !sprout_generator_detail::has_mem_generated_value<T>::value
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&& !sprout_generator_detail::has_adl_generated_value<T>::value
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>::type
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>
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: public std::true_type
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{};
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template<typename T>
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struct select_tuple_get_generated_value<
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T,
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typename std::enable_if<!(
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sprout_generator_detail::has_tuple_get_generated_value<T>::value
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&& !sprout_generator_detail::has_mem_generated_value<T>::value
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&& !sprout_generator_detail::has_adl_generated_value<T>::value
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)>::type
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>
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: public std::false_type
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{};
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template<typename T, typename = void>
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struct noexcept_generated_value;
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template<typename T>
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struct noexcept_generated_value<T, typename std::enable_if<sprout_generator_detail::select_mem_generated_value<T>::value>::type>
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: public std::integral_constant<bool, SPROUT_NOEXCEPT_EXPR_OR_DEFAULT(std::declval<T>().generated_value(), false)>
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{};
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template<typename T>
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struct noexcept_generated_value<T, typename std::enable_if<sprout_generator_detail::select_adl_generated_value<T>::value>::type>
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: public std::integral_constant<bool, SPROUT_NOEXCEPT_EXPR_OR_DEFAULT(generated_value(std::declval<T>()), false)>
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{};
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template<typename T>
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struct noexcept_generated_value<T, typename std::enable_if<sprout_generator_detail::select_tuple_get_generated_value<T>::value>::type>
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: public std::integral_constant<bool, SPROUT_NOEXCEPT_EXPR_OR_DEFAULT(sprout::tuples::get<0>(std::declval<T>()), false)>
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{};
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template<typename T, typename = void>
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struct generated_value_result;
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template<typename T>
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struct generated_value_result<T, typename std::enable_if<sprout_generator_detail::select_mem_generated_value<T>::value>::type> {
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public:
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typedef decltype(std::declval<T>().generated_value()) type;
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};
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template<typename T>
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struct generated_value_result<T, typename std::enable_if<sprout_generator_detail::select_adl_generated_value<T>::value>::type> {
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public:
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typedef decltype(generated_value(std::declval<T>())) type;
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};
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template<typename T>
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struct generated_value_result<T, typename std::enable_if<sprout_generator_detail::select_tuple_get_generated_value<T>::value>::type> {
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public:
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typedef decltype(sprout::tuples::get<0>(std::declval<T>())) type;
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};
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template<
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typename T,
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typename sprout::enabler_if<sprout_generator_detail::select_mem_generated_value<T>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR typename sprout_generator_detail::generated_value_result<T>::type
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generated_value_impl(T&& t)
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SPROUT_NOEXCEPT_EXPR((sprout_generator_detail::noexcept_generated_value<T>::value))
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{
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return sprout::forward<T>(t).generated_value();
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}
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template<
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typename T,
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typename sprout::enabler_if<sprout_generator_detail::select_adl_generated_value<T>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR typename sprout_generator_detail::generated_value_result<T>::type
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generated_value_impl(T&& t)
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SPROUT_NOEXCEPT_EXPR((sprout_generator_detail::noexcept_generated_value<T>::value))
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{
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return generated_value(sprout::forward<T>(t));
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}
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template<
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typename T,
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typename sprout::enabler_if<sprout_generator_detail::select_tuple_get_generated_value<T>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR typename sprout_generator_detail::generated_value_result<T>::type
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generated_value_impl(T&& t)
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SPROUT_NOEXCEPT_EXPR((sprout_generator_detail::noexcept_generated_value<T>::value))
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{
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return sprout::tuples::get<0>(sprout::forward<T>(t));
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}
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} // namespace sprout_generator_detail
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namespace sprout {
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namespace generators {
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//
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// generated_value
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//
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template<typename T>
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inline SPROUT_CONSTEXPR typename sprout_generator_detail::generated_value_result<T>::type
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generated_value(T&& t)
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SPROUT_NOEXCEPT_EXPR((sprout_generator_detail::noexcept_generated_value<T>::value))
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{
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return sprout_generator_detail::generated_value_impl(sprout::forward<T>(t));
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}
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} // namespace generators
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using sprout::generators::generated_value;
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} // namespace sprout
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#endif // #ifndef SPROUT_GENERATOR_GENERATED_VALUE_HPP
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