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rewrite string construction (performance improved)

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This commit is contained in:
bolero-MURAKAMI 2012-04-18 00:58:34 +09:00
parent ece20bf8ef
commit 165b9ee1cd
6 changed files with 48 additions and 68 deletions
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48
sprout/string/make_string.hpp
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@ -4,8 +4,6 @@
#include <cstddef>
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/index_tuple.hpp>
#include <sprout/array.hpp>
#include <sprout/string/char_traits.hpp>
#include <sprout/string/string.hpp>
#include <sprout/utility/forward.hpp>
@ -14,40 +12,13 @@ namespace sprout {
//
// make_string
//
namespace detail {
template<typename T, std::size_t N, sprout::index_t... Indexes>
inline SPROUT_CONSTEXPR sprout::basic_string<T, N - 1> make_string_impl_1(
sprout::array<T, N> const& arr,
std::size_t n,
sprout::index_tuple<Indexes...>
)
{
return sprout::basic_string<T, N - 1>{{(Indexes < n ? arr[Indexes] : T())...}, n};
}
template<typename T, std::size_t N, sprout::index_t... Indexes>
inline SPROUT_CONSTEXPR sprout::basic_string<T, N - 1> make_string_impl(
sprout::array<T, N> const& arr,
sprout::index_tuple<Indexes...>
)
{
return sprout::detail::make_string_impl_1(
arr,
sprout::char_traits<T>::length(arr.begin()),
sprout::index_tuple<Indexes...>()
);
}
} // namespace detail
template<typename T, typename... Types>
inline SPROUT_CONSTEXPR sprout::basic_string<typename std::decay<T>::type, 1 + sizeof...(Types)>
make_string(T&& t, Types&&... args) {
return sprout::detail::make_string_impl(
sprout::make_array<typename std::decay<T>::type>(
sprout::forward<T>(t),
sprout::forward<Types>(args)...,
typename std::decay<T>::type()
),
typename sprout::index_range<0, 1 + sizeof...(Types)>::type()
);
typedef sprout::detail::make_construct_impl<
sprout::basic_string<typename std::decay<T>::type, 1 + sizeof...(Types)>
> impl_type;
return impl_type::make(sprout::forward<T>(t), sprout::forward<Types>(args)...);
}
//
@ -61,13 +32,10 @@ namespace sprout {
template<typename T, typename... Types>
inline SPROUT_CONSTEXPR sprout::basic_string<typename std::decay<T>::type, sizeof...(Types)>
make_string_as(Types&&... args) {
return sprout::detail::make_string_impl(
sprout::make_array<typename std::decay<T>::type>(
sprout::forward<Types>(args)...,
typename std::decay<T>::type()
),
typename sprout::index_range<0, 1 + sizeof...(Types)>::type()
);
typedef sprout::detail::make_construct_impl<
sprout::basic_string<typename std::decay<T>::type, sizeof...(Types)>
> impl_type;
return impl_type::make(sprout::forward<Types>(args)...);
}
} // namespace sprout