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fix sprout::tuples::get

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This commit is contained in:
bolero-MURAKAMI 2012-07-19 19:17:25 +09:00
parent 9069a110e9
commit 196aa8dfbd
2 changed files with 104 additions and 13 deletions
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2
sprout/config/config.hpp
View file

@ -26,9 +26,11 @@
#ifndef SPROUT_CONFIG_DISABLE_NOEXCEPT
# define SPROUT_NOEXCEPT noexcept
# define SPROUT_NOEXCEPT_EXPR(EXPR) noexcept(EXPR)
# define SPROUT_NOEXCEPT_EXPR_OR_DEFAULT(EXPR, C) noexcept(EXPR)
#else // #ifndef SPROUT_CONFIG_DISABLE_NOEXCEPT
# define SPROUT_NOEXCEPT
# define SPROUT_NOEXCEPT_EXPR(EXPR)
# define SPROUT_NOEXCEPT_EXPR_OR_DEFAULT(EXPR, C) C
#endif // #ifndef SPROUT_CONFIG_DISABLE_NOEXCEPT
#ifndef SPROUT_CONFIG_DISABLE_TEMPLATE_ALIASES

115
sprout/tuple/tuple/get.hpp
View file

@ -5,6 +5,7 @@
#include <type_traits>
#include <tuple>
#include <sprout/config.hpp>
#include <sprout/type_traits/enabler_if.hpp>
#include <sprout/utility/forward.hpp>
#include <sprout/tuple/tuple/tuple.hpp>
@ -50,19 +51,6 @@ namespace sprout {
: public sprout::tuples::tuple_element<I, T>
{};
//
// get
//
template<std::size_t I, typename T>
inline SPROUT_CONSTEXPR auto
get(T&& t) SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(std::get<I>(sprout::forward<T>(t))))
-> decltype(std::get<I>(sprout::forward<T>(t)))
{
return std::get<I>(sprout::forward<T>(t));
}
//
// get
//
namespace detail {
template<std::size_t I, typename Head, typename... Tail>
inline SPROUT_CONSTEXPR typename std::add_lvalue_reference<Head>::type
@ -75,6 +63,9 @@ namespace sprout {
return sprout::tuples::detail::tuple_impl<I, Head, Tail...>::head(t);
}
} // namespace detail
//
// get
//
template<std::size_t I, typename... Types>
inline SPROUT_CONSTEXPR typename sprout::tuples::tuple_element<I, sprout::tuples::tuple<Types...> >::type&
get(sprout::tuples::tuple<Types...>& t) SPROUT_NOEXCEPT {
@ -94,6 +85,104 @@ namespace sprout {
}
} // namespace tuples
namespace tuple_detail {
struct not_found_adl_get {};
template<std::size_t I>
sprout::tuple_detail::not_found_adl_get get(...);
template<std::size_t I, typename T>
struct has_std_get_test {
public:
template<
typename U = T,
typename = decltype(std::get<I>(std::declval<U>()))
>
static std::true_type test(int);
static std::false_type test(...);
};
template<std::size_t I, typename T>
struct has_std_get
: public decltype(sprout::tuple_detail::has_std_get_test<I, T>::test(0))
{};
template<std::size_t I, typename T>
struct has_adl_get_test {
public:
template<
typename U = T,
typename sprout::enabler_if<
!std::is_same<decltype(get<I>(std::declval<U>())), sprout::tuple_detail::not_found_adl_get>::value
&& !sprout::tuple_detail::has_std_get<I, T>::value
>::type = sprout::enabler
>
static std::true_type test(int);
static std::false_type test(...);
};
template<std::size_t I, typename T>
struct has_adl_get
: public decltype(sprout::tuple_detail::has_adl_get_test<I, T>::test(0))
{};
template<std::size_t I, typename T, typename = void>
struct noexcept_get;
template<std::size_t I, typename T>
struct noexcept_get<I, T, typename std::enable_if<sprout::tuple_detail::has_adl_get<I, T>::value>::type>
: public std::integral_constant<bool, SPROUT_NOEXCEPT_EXPR_OR_DEFAULT(get<I>(std::declval<T>()), false)>
{};
template<std::size_t I, typename T>
struct noexcept_get<I, T, typename std::enable_if<sprout::tuple_detail::has_std_get<I, T>::value>::type>
: public std::integral_constant<bool, SPROUT_NOEXCEPT_EXPR_OR_DEFAULT(std::get<I>(std::declval<T>()), false)>
{};
template<std::size_t I, typename T, typename = void>
struct get_result;
template<std::size_t I, typename T>
struct get_result<I, T, typename std::enable_if<sprout::tuple_detail::has_adl_get<I, T>::value>::type> {
public:
typedef decltype(get<I>(std::declval<T>())) type;
};
template<std::size_t I, typename T>
struct get_result<I, T, typename std::enable_if<sprout::tuple_detail::has_std_get<I, T>::value>::type> {
public:
typedef decltype(std::get<I>(std::declval<T>())) type;
};
template<
std::size_t I, typename T,
typename sprout::enabler_if<sprout::tuple_detail::has_adl_get<I, T>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR typename sprout::tuple_detail::get_result<I, T>::type
get_impl(T&& t)
SPROUT_NOEXCEPT_EXPR((sprout::tuple_detail::noexcept_get<I, T>::value))
{
return get<I>(sprout::forward<T>(t));
}
template<
std::size_t I, typename T,
typename sprout::enabler_if<sprout::tuple_detail::has_std_get<I, T>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR typename sprout::tuple_detail::get_result<I, T>::type
get_impl(T&& t)
SPROUT_NOEXCEPT_EXPR((sprout::tuple_detail::noexcept_get<I, T>::value))
{
return std::get<I>(sprout::forward<T>(t));
}
} // namespace tuple_detail
namespace tuples {
//
// get
//
template<std::size_t I, typename T>
inline SPROUT_CONSTEXPR typename sprout::tuple_detail::get_result<I, T>::type
get(T&& t)
SPROUT_NOEXCEPT_EXPR((sprout::tuple_detail::noexcept_get<I, T>::value))
{
return sprout::tuple_detail::get_impl<I>(sprout::forward<T>(t));
}
} // namespace tuples
using sprout::tuples::tuple_size;
using sprout::tuples::tuple_element;
using sprout::tuples::get;