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support polymorphic visitor (variant)

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bolero-MURAKAMI 2012-12-19 23:06:08 +09:00
parent 9ee3e03ddd
commit f01382e3e5
8 changed files with 204 additions and 24 deletions
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20
sprout/string/float_to_string.hpp
View file

@ -8,6 +8,7 @@
#include <sprout/index_tuple.hpp>
#include <sprout/string/string.hpp>
#include <sprout/type_traits/enabler_if.hpp>
#include <sprout/math/floor.hpp>
#include <sprout/detail/char_conversion.hpp>
#include <sprout/detail/math/int.hpp>
#include <sprout/detail/math/float.hpp>
@ -32,14 +33,15 @@ namespace sprout {
namespace detail {
template<typename Elem, typename FloatType, sprout::index_t... Indexes>
inline SPROUT_CONSTEXPR sprout::basic_string<Elem, sprout::printed_float_digits<FloatType>::value>
float_to_string(FloatType val, bool negative, int digits, sprout::index_tuple<Indexes...>) {
float_to_string_impl(FloatType val, bool negative, int digits, int v, sprout::index_tuple<Indexes...>) {
return negative
? sprout::basic_string<Elem, sprout::printed_float_digits<FloatType>::value>{
{
static_cast<Elem>('-'),
(Indexes < digits ? sprout::detail::int_to_char<Elem>(sprout::detail::float_digit_at(val, digits - 1 - Indexes))
: Indexes == digits ? static_cast<Elem>('.')
: Indexes < digits + 1 + sprout::detail::decimal_places_length ? sprout::detail::int_to_char<Elem>(sprout::detail::float_digit_at(val, digits - Indexes))
: Indexes < digits + 1 + sprout::detail::decimal_places_length
? sprout::detail::int_to_char<Elem>(sprout::detail::int_digit_at(v, digits + sprout::detail::decimal_places_length - Indexes))
: Elem()
)...
},
@ -49,7 +51,8 @@ namespace sprout {
{
(Indexes < digits ? sprout::detail::int_to_char<Elem>(sprout::detail::float_digit_at(val, digits - 1 - Indexes))
: Indexes == digits ? static_cast<Elem>('.')
: Indexes < digits + 1 + sprout::detail::decimal_places_length ? sprout::detail::int_to_char<Elem>(sprout::detail::float_digit_at(val, digits - Indexes))
: Indexes < digits + 1 + sprout::detail::decimal_places_length
? sprout::detail::int_to_char<Elem>(sprout::detail::int_digit_at(v, digits + sprout::detail::decimal_places_length - Indexes))
: Elem()
)...
},
@ -57,6 +60,14 @@ namespace sprout {
}
;
}
template<typename Elem, typename FloatType>
inline SPROUT_CONSTEXPR sprout::basic_string<Elem, sprout::printed_float_digits<FloatType>::value>
float_to_string(FloatType val, bool negative, int digits) {
return sprout::detail::float_to_string_impl<Elem>(
val, negative, digits, static_cast<int>((val - sprout::floor(val)) * sprout::detail::int_pow<int>(sprout::detail::decimal_places_length)),
sprout::index_range<0, sprout::printed_float_digits<FloatType>::value - 1>::make()
);
}
} // namespace detail
//
@ -71,8 +82,7 @@ namespace sprout {
return sprout::detail::float_to_string<Elem>(
sprout::detail::float_round_at(val < 0 ? -val : val, sprout::detail::decimal_places_length),
val < 0,
sprout::detail::float_digits(val),
sprout::index_range<0, sprout::printed_float_digits<FloatType>::value - 1>::make()
sprout::detail::float_digits(val)
);
}

16
sprout/string/shrink.hpp
View file

@ -58,6 +58,22 @@ namespace sprout {
shrink(sprout::basic_string<T, N, Traits> const& s) {
return sprout::shrink_string<T, N, Traits>(s);
}
template<std::size_t To, typename T, std::size_t N, typename Traits>
inline SPROUT_CONSTEXPR sprout::basic_string<T, To, Traits>
shrink(sprout::basic_string<T, N, Traits> const& s) {
return sprout::shrink(s);
}
template<typename T, std::size_t N>
inline SPROUT_CONSTEXPR sprout::shrink_string<T, N>
shrink(T const(& arr)[N]) {
return sprout::shrink(sprout::to_string(arr));
}
template<std::size_t To, typename T, std::size_t N>
inline SPROUT_CONSTEXPR sprout::basic_string<T, To>
shrink(T const(& arr)[N]) {
return sprout::shrink<To>(sprout::to_string(arr));
}
} // namespace sprout
#endif // #ifndef SPROUT_STRING_SHRINK_HPP

25
sprout/string/stretch.hpp Normal file
View file

@ -0,0 +1,25 @@
#ifndef SPROUT_STRING_STRETCH_HPP
#define SPROUT_STRING_STRETCH_HPP
#include <cstddef>
#include <sprout/config.hpp>
#include <sprout/string/string.hpp>
namespace sprout {
//
// stretch
//
template<std::size_t To, typename T, std::size_t N, typename Traits>
inline SPROUT_CONSTEXPR sprout::basic_string<T, To, Traits>
stretch(sprout::basic_string<T, N, Traits> const& s) {
return s;
}
template<std::size_t To, typename T, std::size_t N>
inline SPROUT_CONSTEXPR sprout::basic_string<T, To>
stretch(T const(& arr)[N]) {
return sprout::stretch<To>(sprout::to_string(arr));
}
} // namespace sprout
#endif // #ifndef SPROUT_STRING_STRETCH_HPP

11
sprout/string/string.hpp
View file

@ -861,9 +861,6 @@ namespace sprout {
};
} // namespace detail
//
// to_string
//
namespace detail {
template<typename T, std::size_t N, sprout::index_t... Indexes>
inline SPROUT_CONSTEXPR sprout::basic_string<T, N - 1>
@ -880,6 +877,14 @@ namespace sprout {
return to_string_impl_1(arr, sprout::char_traits<T>::length(arr), sprout::index_tuple<Indexes...>());
}
} // namespace detail
//
// to_string
//
template<typename T, std::size_t N, typename Traits>
inline SPROUT_CONSTEXPR sprout::basic_string<T, N, Traits>
to_string(sprout::basic_string<T, N, Traits> const& s) {
return s;
}
template<typename T, std::size_t N>
inline SPROUT_CONSTEXPR sprout::basic_string<T, N - 1>
to_string(T const(& arr)[N]) {