mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-12-25 21:35:41 +00:00
283 lines
10 KiB
C++
283 lines
10 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2011-2017 Bolero MURAKAMI
|
|
https://github.com/bolero-MURAKAMI/Sprout
|
|
|
|
Distributed under 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)
|
|
=============================================================================*/
|
|
#ifndef SPROUT_GENERATOR_DETAIL_GENERATED_VALUE_HPP
|
|
#define SPROUT_GENERATOR_DETAIL_GENERATED_VALUE_HPP
|
|
|
|
#include <utility>
|
|
#include <type_traits>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/type_traits/integral_constant.hpp>
|
|
#include <sprout/type_traits/identity.hpp>
|
|
#include <sprout/iterator/const_reference_cast.hpp>
|
|
#include <sprout/iterator/type_traits/is_iterator_of.hpp>
|
|
#include <sprout/utility/as_const.hpp>
|
|
#include <sprout/utility/move.hpp>
|
|
#include <sprout/tuple/tuple.hpp>
|
|
#include <sprout/adl/not_found.hpp>
|
|
|
|
namespace sprout_adl {
|
|
sprout::not_found_via_adl get_generated_value(...);
|
|
} // namespace sprout_adl
|
|
|
|
namespace sprout {
|
|
namespace detail {
|
|
template<typename T>
|
|
struct has_mem_generated_value_test {
|
|
public:
|
|
template<
|
|
typename U = T,
|
|
typename = typename sprout::identity<decltype(std::declval<U>().generated_value())>::type
|
|
>
|
|
static sprout::true_type test(int);
|
|
static sprout::false_type test(...);
|
|
};
|
|
#if defined(_MSC_VER) && (_MSC_VER > 1900)
|
|
template<typename T, typename Base_ = typename sprout::identity<decltype(sprout::detail::has_mem_generated_value_test<T>::test(0))>::type>
|
|
struct has_mem_generated_value
|
|
: public Base_
|
|
{};
|
|
#else
|
|
template<typename T>
|
|
struct has_mem_generated_value
|
|
: public sprout::identity<decltype(sprout::detail::has_mem_generated_value_test<T>::test(0))>::type
|
|
{};
|
|
#endif
|
|
|
|
template<typename T>
|
|
struct is_substitutable_const_generated_value
|
|
: public sprout::bool_constant<
|
|
sprout::detail::has_mem_generated_value<T const>::value
|
|
>
|
|
{};
|
|
|
|
template<typename Gen, typename = void>
|
|
struct get_generated_value_impl;
|
|
|
|
template<typename Gen>
|
|
struct get_generated_value_impl<
|
|
Gen,
|
|
typename std::enable_if<
|
|
std::is_lvalue_reference<Gen>::value && !std::is_const<typename std::remove_reference<Gen>::type>::value
|
|
&& sprout::detail::is_substitutable_const_generated_value<Gen>::value
|
|
>::type
|
|
> {
|
|
public:
|
|
static SPROUT_CONSTEXPR decltype(std::declval<Gen>().generated_value())
|
|
get_generated_value(Gen gen)
|
|
SPROUT_NOEXCEPT_IF_EXPR(std::declval<Gen>().generated_value())
|
|
{
|
|
typedef decltype(std::declval<Gen>().generated_value()) type;
|
|
return sprout::const_reference_cast<type>(sprout::as_const(gen).generated_value());
|
|
}
|
|
};
|
|
template<typename Gen>
|
|
struct get_generated_value_impl<
|
|
Gen,
|
|
typename std::enable_if<
|
|
std::is_lvalue_reference<Gen>::value && !std::is_const<typename std::remove_reference<Gen>::type>::value
|
|
&& !sprout::detail::is_substitutable_const_generated_value<Gen>::value
|
|
&& sprout::detail::has_mem_generated_value<Gen>::value
|
|
>::type
|
|
> {
|
|
public:
|
|
static SPROUT_CONSTEXPR decltype(std::declval<Gen>().generated_value())
|
|
get_generated_value(Gen gen)
|
|
SPROUT_NOEXCEPT_IF_EXPR(std::declval<Gen>().generated_value())
|
|
{
|
|
return gen.generated_value();
|
|
}
|
|
};
|
|
template<typename Gen>
|
|
struct get_generated_value_impl<
|
|
Gen,
|
|
typename std::enable_if<
|
|
std::is_lvalue_reference<Gen>::value && !std::is_const<typename std::remove_reference<Gen>::type>::value
|
|
&& !sprout::detail::is_substitutable_const_generated_value<Gen>::value
|
|
&& !sprout::detail::has_mem_generated_value<Gen>::value
|
|
&& sprout::is_input_iterator<Gen>::value
|
|
>::type
|
|
> {
|
|
public:
|
|
static SPROUT_CONSTEXPR decltype(*std::declval<Gen>())
|
|
get_generated_value(Gen gen)
|
|
SPROUT_NOEXCEPT_IF_EXPR(*std::declval<Gen>())
|
|
{
|
|
return *gen;
|
|
}
|
|
};
|
|
template<typename Gen>
|
|
struct get_generated_value_impl<
|
|
Gen,
|
|
typename std::enable_if<
|
|
std::is_lvalue_reference<Gen>::value && !std::is_const<typename std::remove_reference<Gen>::type>::value
|
|
&& !sprout::detail::is_substitutable_const_generated_value<Gen>::value
|
|
&& !sprout::detail::has_mem_generated_value<Gen>::value
|
|
&& !sprout::is_input_iterator<Gen>::value
|
|
>::type
|
|
> {
|
|
public:
|
|
static SPROUT_CONSTEXPR decltype(sprout::tuples::get<0>(std::declval<Gen>()))
|
|
get_generated_value(Gen gen)
|
|
SPROUT_NOEXCEPT_IF_EXPR(sprout::tuples::get<0>(std::declval<Gen>()))
|
|
{
|
|
return sprout::tuples::get<0>(gen);
|
|
}
|
|
};
|
|
|
|
template<typename Gen>
|
|
struct get_generated_value_impl<
|
|
Gen,
|
|
typename std::enable_if<
|
|
std::is_rvalue_reference<Gen>::value && !std::is_const<typename std::remove_reference<Gen>::type>::value
|
|
&& sprout::detail::is_substitutable_const_generated_value<Gen>::value
|
|
>::type
|
|
> {
|
|
public:
|
|
static SPROUT_CONSTEXPR decltype(std::declval<Gen>().generated_value())
|
|
get_generated_value(Gen gen)
|
|
SPROUT_NOEXCEPT_IF_EXPR(std::declval<Gen>().generated_value())
|
|
{
|
|
typedef decltype(std::declval<Gen>().generated_value()) type;
|
|
return sprout::const_reference_cast<type>(sprout::as_const(sprout::move(gen)).generated_value());
|
|
}
|
|
};
|
|
template<typename Gen>
|
|
struct get_generated_value_impl<
|
|
Gen,
|
|
typename std::enable_if<
|
|
std::is_rvalue_reference<Gen>::value && !std::is_const<typename std::remove_reference<Gen>::type>::value
|
|
&& !sprout::detail::is_substitutable_const_generated_value<Gen>::value
|
|
&& sprout::detail::has_mem_generated_value<Gen>::value
|
|
>::type
|
|
> {
|
|
public:
|
|
static SPROUT_CONSTEXPR decltype(std::declval<Gen>().generated_value())
|
|
get_generated_value(Gen gen)
|
|
SPROUT_NOEXCEPT_IF_EXPR(std::declval<Gen>().generated_value())
|
|
{
|
|
return sprout::move(gen).generated_value();
|
|
}
|
|
};
|
|
template<typename Gen>
|
|
struct get_generated_value_impl<
|
|
Gen,
|
|
typename std::enable_if<
|
|
std::is_rvalue_reference<Gen>::value && !std::is_const<typename std::remove_reference<Gen>::type>::value
|
|
&& !sprout::detail::is_substitutable_const_generated_value<Gen>::value
|
|
&& !sprout::detail::has_mem_generated_value<Gen>::value
|
|
&& sprout::is_input_iterator<Gen>::value
|
|
>::type
|
|
> {
|
|
public:
|
|
static SPROUT_CONSTEXPR decltype(*std::declval<Gen>())
|
|
get_generated_value(Gen gen)
|
|
SPROUT_NOEXCEPT_IF_EXPR(*std::declval<Gen>())
|
|
{
|
|
return *sprout::move(gen);
|
|
}
|
|
};
|
|
template<typename Gen>
|
|
struct get_generated_value_impl<
|
|
Gen,
|
|
typename std::enable_if<
|
|
std::is_rvalue_reference<Gen>::value && !std::is_const<typename std::remove_reference<Gen>::type>::value
|
|
&& !sprout::detail::is_substitutable_const_generated_value<Gen>::value
|
|
&& !sprout::detail::has_mem_generated_value<Gen>::value
|
|
&& !sprout::is_input_iterator<Gen>::value
|
|
>::type
|
|
> {
|
|
public:
|
|
static SPROUT_CONSTEXPR decltype(sprout::tuples::get<0>(std::declval<Gen>()))
|
|
get_generated_value(Gen gen)
|
|
SPROUT_NOEXCEPT_IF_EXPR(sprout::tuples::get<0>(std::declval<Gen>()))
|
|
{
|
|
return sprout::tuples::get<0>(sprout::move(gen));
|
|
}
|
|
};
|
|
|
|
template<typename Gen>
|
|
struct get_generated_value_impl<
|
|
Gen,
|
|
typename std::enable_if<
|
|
std::is_reference<Gen>::value && std::is_const<typename std::remove_reference<Gen>::type>::value
|
|
&& sprout::detail::has_mem_generated_value<Gen const>::value
|
|
>::type
|
|
> {
|
|
public:
|
|
static SPROUT_CONSTEXPR decltype(std::declval<Gen>().generated_value())
|
|
get_generated_value(Gen gen)
|
|
SPROUT_NOEXCEPT_IF_EXPR(std::declval<Gen>().generated_value())
|
|
{
|
|
return gen.generated_value();
|
|
}
|
|
};
|
|
template<typename Gen>
|
|
struct get_generated_value_impl<
|
|
Gen,
|
|
typename std::enable_if<
|
|
std::is_reference<Gen>::value && std::is_const<typename std::remove_reference<Gen>::type>::value
|
|
&& !sprout::detail::has_mem_generated_value<Gen const>::value
|
|
&& sprout::is_input_iterator<Gen>::value
|
|
>::type
|
|
> {
|
|
public:
|
|
static SPROUT_CONSTEXPR decltype(*std::declval<Gen>())
|
|
get_generated_value(Gen gen)
|
|
SPROUT_NOEXCEPT_IF_EXPR(*std::declval<Gen>())
|
|
{
|
|
return *gen;
|
|
}
|
|
};
|
|
template<typename Gen>
|
|
struct get_generated_value_impl<
|
|
Gen,
|
|
typename std::enable_if<
|
|
std::is_reference<Gen>::value && std::is_const<typename std::remove_reference<Gen>::type>::value
|
|
&& !sprout::detail::has_mem_generated_value<Gen const>::value
|
|
&& !sprout::is_input_iterator<Gen>::value
|
|
>::type
|
|
> {
|
|
public:
|
|
static SPROUT_CONSTEXPR decltype(sprout::tuples::get<0>(std::declval<Gen>()))
|
|
get_generated_value(Gen gen)
|
|
SPROUT_NOEXCEPT_IF_EXPR(sprout::tuples::get<0>(std::declval<Gen>()))
|
|
{
|
|
return sprout::tuples::get<0>(gen);
|
|
}
|
|
};
|
|
} // namespace detail
|
|
} // namespace sprout
|
|
|
|
namespace sprout_generator_detail {
|
|
template<typename Gen>
|
|
inline SPROUT_CONSTEXPR decltype(sprout::detail::get_generated_value_impl<Gen&>::get_generated_value(std::declval<Gen&>()))
|
|
get_generated_value(Gen& gen)
|
|
SPROUT_NOEXCEPT_IF_EXPR(sprout::detail::get_generated_value_impl<Gen&>::get_generated_value(std::declval<Gen&>()))
|
|
{
|
|
return sprout::detail::get_generated_value_impl<Gen&>::get_generated_value(gen);
|
|
}
|
|
template<typename Gen>
|
|
inline SPROUT_CONSTEXPR typename std::enable_if<
|
|
!std::is_const<Gen>::value && !std::is_volatile<Gen>::value && !std::is_reference<Gen>::value,
|
|
decltype(sprout::detail::get_generated_value_impl<Gen&&>::get_generated_value(std::declval<Gen&&>()))
|
|
>::type
|
|
get_generated_value(Gen&& gen)
|
|
SPROUT_NOEXCEPT_IF_EXPR(sprout::detail::get_generated_value_impl<Gen&&>::get_generated_value(std::declval<Gen&&>()))
|
|
{
|
|
return sprout::detail::get_generated_value_impl<Gen&&>::get_generated_value(sprout::move(gen));
|
|
}
|
|
template<typename Gen>
|
|
inline SPROUT_CONSTEXPR decltype(sprout::detail::get_generated_value_impl<Gen const&>::get_generated_value(std::declval<Gen const&>()))
|
|
get_generated_value(Gen const& gen)
|
|
SPROUT_NOEXCEPT_IF_EXPR(sprout::detail::get_generated_value_impl<Gen const&>::get_generated_value(std::declval<Gen const&>()))
|
|
{
|
|
return sprout::detail::get_generated_value_impl<Gen const&>::get_generated_value(gen);
|
|
}
|
|
} // namespace sprout_generator_detail
|
|
|
|
#endif // #ifndef SPROUT_GENERATOR_DETAIL_GENERATED_VALUE_HPP
|