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rewrite string concat

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bolero-MURAKAMI 2012-04-18 13:37:35 +09:00
parent 165b9ee1cd
commit 22f13db2a0
1 changed files with 145 additions and 46 deletions
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191
sprout/string/concat.hpp
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@ -4,64 +4,163 @@
#include <cstddef> #include <cstddef>
#include <type_traits> #include <type_traits>
#include <sprout/config.hpp> #include <sprout/config.hpp>
#include <sprout/index_tuple.hpp>
#include <sprout/string/char_traits.hpp>
#include <sprout/string/string.hpp> #include <sprout/string/string.hpp>
#include <sprout/operation/fixed/push_back.hpp> //#include <sprout/operation/fixed/push_back.hpp>
#include <sprout/operation/fixed/push_front.hpp> //#include <sprout/operation/fixed/push_front.hpp>
#include <sprout/operation/fixed/append_back.hpp> //#include <sprout/operation/fixed/append_back.hpp>
#include <sprout/operation/fixed/append_front.hpp> //#include <sprout/operation/fixed/append_front.hpp>
namespace sprout { namespace sprout {
namespace detail {
template<typename T, std::size_t N, typename Traits, sprout::index_t... Indexes>
inline SPROUT_CONSTEXPR sprout::basic_string<T, N + 1, Traits>
string_concat(
sprout::basic_string<T, N, Traits> const& lhs,
std::size_t lsize,
T const& rhs,
sprout::index_tuple<Indexes...>
)
{
return sprout::basic_string<T, N + 1, Traits>{
{
(Indexes < lsize ? lhs[Indexes]
: Indexes < lsize + 1 ? rhs
: T()
)...
},
lsize + 1
};
}
template<typename T, std::size_t N, typename Traits, sprout::index_t... Indexes>
inline SPROUT_CONSTEXPR sprout::basic_string<T, 1 + N, Traits>
string_concat(
T const& lhs,
sprout::basic_string<T, N, Traits> const& rhs,
std::size_t rsize,
sprout::index_tuple<Indexes...>
)
{
return sprout::basic_string<T, 1 + N, Traits>{
{
(Indexes < 1 ? lhs
: Indexes < 1 + rsize ? rhs[Indexes - 1]
: T()
)...
},
1 + rsize
};
}
template<typename T, std::size_t N, typename Traits, std::size_t M, sprout::index_t... Indexes>
inline SPROUT_CONSTEXPR sprout::basic_string<T, N + (M - 1), Traits>
string_concat(
sprout::basic_string<T, N, Traits> const& lhs,
std::size_t lsize,
T const (& rhs)[M],
std::size_t rsize,
sprout::index_tuple<Indexes...>
)
{
return sprout::basic_string<T, N + (M - 1), Traits>{
{
(Indexes < lsize ? lhs[Indexes]
: Indexes < lsize + rsize ? rhs[Indexes - lsize]
: T()
)...
},
lsize + rsize
};
}
template<typename T, std::size_t N, typename Traits, std::size_t M, sprout::index_t... Indexes>
inline SPROUT_CONSTEXPR sprout::basic_string<T, (M - 1) + N, Traits>
string_concat(
T const (& lhs)[M],
std::size_t lsize,
sprout::basic_string<T, N, Traits> const& rhs,
std::size_t rsize,
sprout::index_tuple<Indexes...>
)
{
return sprout::basic_string<T, (M - 1) + N, Traits>{
{
(Indexes < lsize ? lhs[Indexes]
: Indexes < lsize + rsize ? rhs[Indexes - lsize]
: T()
)...
},
lsize + rsize
};
}
template<typename T, std::size_t N1, std::size_t N2, typename Traits, sprout::index_t... Indexes>
inline SPROUT_CONSTEXPR sprout::basic_string<T, N1 + N2, Traits>
string_concat(
sprout::basic_string<T, N1, Traits> const& lhs,
std::size_t lsize,
sprout::basic_string<T, N2, Traits> const& rhs,
std::size_t rsize,
sprout::index_tuple<Indexes...>
)
{
return sprout::basic_string<T, N1 + N2, Traits>{
{
(Indexes < lsize ? lhs[Indexes]
: Indexes < lsize + rsize ? rhs[Indexes - lsize]
: T()
)...
},
lsize + rsize
};
}
} // namespace detail
// //
// operator+ // operator+
// //
template<typename T, std::size_t N, typename Traits> template<typename T, std::size_t N, typename Traits>
inline SPROUT_CONSTEXPR typename sprout::fixed::result_of::push_back<sprout::basic_string<T, N, Traits>, T>::type operator+( inline SPROUT_CONSTEXPR sprout::basic_string<T, N + 1, Traits>
sprout::basic_string<T, N, Traits> const& lhs, operator+(sprout::basic_string<T, N, Traits> const& lhs, T const& rhs) {
T const& rhs return sprout::detail::string_concat(
) lhs, lhs.size(),
{ rhs,
return sprout::fixed::push_back(lhs, rhs); sprout::index_range<0, N + 1>::make()
);
} }
template<typename T, std::size_t N, typename Traits> template<typename T, std::size_t N, typename Traits>
inline SPROUT_CONSTEXPR typename sprout::fixed::result_of::push_front<sprout::basic_string<T, N, Traits>, T>::type operator+( inline SPROUT_CONSTEXPR sprout::basic_string<T, 1 + N, Traits>
T const& lhs, operator+(T const& lhs, sprout::basic_string<T, N, Traits> const& rhs) {
sprout::basic_string<T, N, Traits> const& rhs return sprout::detail::string_concat(
) lhs,
{ rhs, rhs.size(),
return sprout::fixed::push_front(rhs, lhs); sprout::index_range<0, 1 + N>::make()
);
} }
template<typename T, std::size_t N, typename Traits, std::size_t N2> template<typename T, std::size_t N, typename Traits, std::size_t M>
inline SPROUT_CONSTEXPR typename sprout::fixed::result_of::append_back< inline SPROUT_CONSTEXPR sprout::basic_string<T, N + (M - 1), Traits>
sprout::basic_string<T, N, Traits>, operator+(sprout::basic_string<T, N, Traits> const& lhs, T const (& rhs)[M]) {
sprout::basic_string<T, N2 - 1, Traits> return sprout::detail::string_concat(
>::type operator+( lhs, lhs.size(),
sprout::basic_string<T, N, Traits> const& lhs, rhs, sprout::char_traits<T>::length(rhs),
T const (& rhs)[N2] sprout::index_range<0, N + (M - 1)>::make()
) );
{
return sprout::fixed::append_back(lhs, sprout::to_string(rhs));
} }
template<typename T, std::size_t N, typename Traits, std::size_t N2> template<typename T, std::size_t N, typename Traits, std::size_t M>
inline SPROUT_CONSTEXPR typename sprout::fixed::result_of::append_front< inline SPROUT_CONSTEXPR sprout::basic_string<T, (M - 1) + N, Traits>
sprout::basic_string<T, N, Traits>, operator+(T const (& lhs)[M], sprout::basic_string<T, N, Traits> const& rhs) {
sprout::basic_string<T, N2 - 1, Traits> return sprout::detail::string_concat(
>::type operator+( lhs, sprout::char_traits<T>::length(lhs),
T const (& lhs)[N2], rhs, rhs.size(),
sprout::basic_string<T, N, Traits> const& rhs sprout::index_range<0, (M - 1) + N>::make()
) );
{
return sprout::fixed::append_front(rhs, sprout::to_string(lhs));
} }
template<typename T, std::size_t N, typename Traits, std::size_t N2> template<typename T, std::size_t N1, std::size_t N2, typename Traits>
inline SPROUT_CONSTEXPR typename sprout::fixed::result_of::append_back< inline SPROUT_CONSTEXPR sprout::basic_string<T, N1 + N2, Traits>
sprout::basic_string<T, N, Traits>, operator+(sprout::basic_string<T, N1, Traits> const& lhs, sprout::basic_string<T, N2, Traits> const& rhs) {
sprout::basic_string<T, N2, Traits> return sprout::detail::string_concat(
>::type operator+( lhs, lhs.size(),
sprout::basic_string<T, N, Traits> const& lhs, rhs, rhs.size(),
sprout::basic_string<T, N2, Traits> const& rhs sprout::index_range<0, N1 + N2>::make()
) );
{
return sprout::fixed::append_back(lhs, rhs);
} }
} // namespace sprout } // namespace sprout