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fix hash implementation

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This commit is contained in:
bolero-MURAKAMI 2013-02-04 18:42:39 +09:00
parent 0a5f16ee81
commit 4332b26a0e
22 changed files with 412 additions and 216 deletions
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145
sprout/functional/hash/to_hash.hpp Normal file
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#ifndef SPROUT_FUNCTIONAL_HASH_TO_HASH_HPP
#define SPROUT_FUNCTIONAL_HASH_TO_HASH_HPP
#include <cstddef>
#include <utility>
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/functional/hash/hash_fwd.hpp>
#include <sprout/functional/hash/hash_value.hpp>
#include <sprout/utility/forward.hpp>
#include <sprout/type_traits/enabler_if.hpp>
#include <sprout/adl/not_found.hpp>
namespace sprout_adl {
sprout::not_found_via_adl hash_value(...);
} // namespace sprout_adl
namespace sprout_hash_detail {
using sprout::hash_value;
using sprout_adl::hash_value;
template<typename T>
struct has_adl_hash_value_test {
public:
template<
typename U = T,
typename sprout::enabler_if<
sprout::is_found_via_adl<decltype(hash_value(std::declval<U>()))>::value
>::type = sprout::enabler
>
static std::true_type test(int);
static std::false_type test(...);
};
#if defined(_MSC_VER)
template<typename T, typename Base_ = decltype(sprout_hash_detail::has_adl_hash_value_test<T>::test(0))>
struct has_adl_hash_value
: public Base_
{};
#else
template<typename T>
struct has_adl_hash_value
: public decltype(sprout_hash_detail::has_adl_hash_value_test<T>::test(0))
{};
#endif
template<typename T, typename Enable = void>
struct select_adl_hash_value;
template<typename T>
struct select_adl_hash_value<
T,
typename std::enable_if<
sprout_hash_detail::has_adl_hash_value<T>::value
>::type
>
: public std::true_type
{};
template<typename T>
struct select_adl_hash_value<
T,
typename std::enable_if<!(
sprout_hash_detail::has_adl_hash_value<T>::value
)>::type
>
: public std::false_type
{};
template<typename T, typename Enable = void>
struct select_std_hash;
template<typename T>
struct select_std_hash<
T,
typename std::enable_if<
!sprout_hash_detail::has_adl_hash_value<T>::value
>::type
>
: public std::true_type
{};
template<typename T>
struct select_std_hash<
T,
typename std::enable_if<!(
!sprout_hash_detail::has_adl_hash_value<T>::value
)>::type
>
: public std::false_type
{};
template<typename T, typename = void>
struct noexcept_to_hash;
template<typename T>
struct noexcept_to_hash<T, typename std::enable_if<sprout_hash_detail::select_adl_hash_value<T>::value>::type>
: public std::integral_constant<bool, SPROUT_NOEXCEPT_EXPR_OR_DEFAULT(hash_value(std::declval<T>()), false)>
{};
template<typename T>
struct noexcept_to_hash<T, typename std::enable_if<sprout_hash_detail::select_std_hash<T>::value>::type>
: public std::integral_constant<bool, SPROUT_NOEXCEPT_EXPR_OR_DEFAULT(std::hash<typename std::decay<T>::type>()(std::declval<T>()), false)>
{};
template<typename T, typename = void>
struct to_hash_result;
template<typename T>
struct to_hash_result<T, typename std::enable_if<sprout_hash_detail::select_adl_hash_value<T>::value>::type> {
public:
typedef decltype(hash_value(std::declval<T>())) type;
};
template<typename T>
struct to_hash_result<T, typename std::enable_if<sprout_hash_detail::select_std_hash<T>::value>::type> {
public:
typedef decltype(std::hash<typename std::decay<T>::type>()(std::declval<T>())) type;
};
template<
typename T,
typename sprout::enabler_if<sprout_hash_detail::select_adl_hash_value<T>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR typename sprout_hash_detail::to_hash_result<T>::type
to_hash_impl(T&& t)
SPROUT_NOEXCEPT_EXPR((sprout_hash_detail::noexcept_to_hash<T>::value))
{
return hash_value(sprout::forward<T>(t));
}
template<
typename T,
typename sprout::enabler_if<sprout_hash_detail::select_std_hash<T>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR typename sprout_hash_detail::to_hash_result<T>::type
to_hash_impl(T&& t)
SPROUT_NOEXCEPT_EXPR((sprout_hash_detail::noexcept_to_hash<T>::value))
{
return std::hash<typename std::decay<T>::type>()(sprout::forward<T>(t));
}
} // namespace sprout_hash_detail
namespace sprout {
//
// to_hash
//
template<typename T>
inline SPROUT_CONSTEXPR std::size_t
to_hash(T const& v) {
return sprout_hash_detail::to_hash_impl(v);
}
} // namespace sprout
#endif // #ifndef SPROUT_FUNCTIONAL_HASH_TO_HASH_HPP