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rewrite string construction (performance improved)

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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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56
sprout/string/string.hpp
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@ -8,10 +8,12 @@
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/index_tuple.hpp>
#include <sprout/array.hpp>
#include <sprout/iterator/reverse_iterator.hpp>
#include <sprout/utility/forward.hpp>
#include <sprout/string/char_traits.hpp>
#include HDR_ALGORITHM_SSCRISK_CEL_OR_SPROUT
#include HDR_ITERATOR_SSCRISK_CEL_OR_SPROUT
#if SPROUT_USE_INDEX_ITERATOR_IMPLEMENTATION
# include <sprout/iterator/index_iterator.hpp>
#endif
@ -453,35 +455,45 @@ namespace sprout {
private:
typedef sprout::basic_string<T, N, Traits> copied_type;
private:
template<std::size_t S>
static SPROUT_CONSTEXPR copied_type make_impl(typename copied_type::size_type size) {
return copied_type{{}, size};
template<std::size_t M>
static SPROUT_CONSTEXPR typename copied_type::size_type length_impl(sprout::array<T, M> const& arr) {
return NS_SSCRISK_CEL_OR_SPROUT::distance(
arr.begin(),
NS_SSCRISK_CEL_OR_SPROUT::find(arr.begin(), arr.end(), T())
);
}
template<std::size_t S, typename Head, typename... Tail>
static SPROUT_CONSTEXPR typename std::enable_if<
S == sizeof...(Tail),
copied_type
>::type make_impl(typename copied_type::size_type size, Head&& head, Tail&&... tail) {
return copied_type{{sprout::forward<Tail>(tail)..., sprout::forward<Head>(head)}, size};
}
template<std::size_t S, typename Head, typename... Tail>
static SPROUT_CONSTEXPR typename std::enable_if<
S != sizeof...(Tail),
copied_type
>::type make_impl(typename copied_type::size_type size, Head&& head, Tail&&... tail) {
return make_impl<S + 1>(size, sprout::forward<Tail>(tail)..., S >= size ? T() : sprout::forward<Head>(head));
template<typename... Args, sprout::index_t... Indexes>
static SPROUT_CONSTEXPR copied_type make_impl(
typename copied_type::size_type size,
sprout::index_tuple<Indexes...>,
Args&&... args
)
{
return copied_type{
{(Indexes < size ? sprout::forward<Args>(args) : T())...},
size
};
}
public:
static SPROUT_CONSTEXPR typename copied_type::size_type length() {
return 0;
template<typename... Args>
static SPROUT_CONSTEXPR typename copied_type::size_type length(Args&&... args) {
return length_impl(sprout::make_array<T>(sprout::forward<Args>(args)...));
}
template<typename... Tail>
static SPROUT_CONSTEXPR typename copied_type::size_type length(T const& head, Tail&&... tail) {
return !head ? 0 : 1 + length(sprout::forward<Tail>(tail)...);
template<typename... Args>
static SPROUT_CONSTEXPR copied_type make(Args&&... args) {
return make_impl(
length(args...),
sprout::index_range<0, sizeof...(Args)>::make(),
sprout::forward<Args>(args)...
);
}
template<typename... Args>
static SPROUT_CONSTEXPR copied_type make(typename copied_type::size_type size, Args&&... args) {
return make_impl<0>(size, sprout::forward<Args>(args)...);
return make_impl(
size,
sprout::index_range<0, sizeof...(Args)>::make(),
sprout::forward<Args>(args)...
);
}
};
} // namespace detail