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https://github.com/bolero-MURAKAMI/Sprout.git
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support polymorphic visitor (variant)
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parent
9ee3e03ddd
commit
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8 changed files with 204 additions and 24 deletions
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@ -8,6 +8,7 @@
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#include <sprout/index_tuple.hpp>
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#include <sprout/string/string.hpp>
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#include <sprout/type_traits/enabler_if.hpp>
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#include <sprout/math/floor.hpp>
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#include <sprout/detail/char_conversion.hpp>
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#include <sprout/detail/math/int.hpp>
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#include <sprout/detail/math/float.hpp>
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@ -32,14 +33,15 @@ namespace sprout {
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namespace detail {
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template<typename Elem, typename FloatType, sprout::index_t... Indexes>
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inline SPROUT_CONSTEXPR sprout::basic_string<Elem, sprout::printed_float_digits<FloatType>::value>
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float_to_string(FloatType val, bool negative, int digits, sprout::index_tuple<Indexes...>) {
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float_to_string_impl(FloatType val, bool negative, int digits, int v, sprout::index_tuple<Indexes...>) {
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return negative
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? sprout::basic_string<Elem, sprout::printed_float_digits<FloatType>::value>{
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{
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static_cast<Elem>('-'),
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(Indexes < digits ? sprout::detail::int_to_char<Elem>(sprout::detail::float_digit_at(val, digits - 1 - Indexes))
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: Indexes == digits ? static_cast<Elem>('.')
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: Indexes < digits + 1 + sprout::detail::decimal_places_length ? sprout::detail::int_to_char<Elem>(sprout::detail::float_digit_at(val, digits - Indexes))
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: Indexes < digits + 1 + sprout::detail::decimal_places_length
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? sprout::detail::int_to_char<Elem>(sprout::detail::int_digit_at(v, digits + sprout::detail::decimal_places_length - Indexes))
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: Elem()
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)...
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},
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@ -49,7 +51,8 @@ namespace sprout {
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{
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(Indexes < digits ? sprout::detail::int_to_char<Elem>(sprout::detail::float_digit_at(val, digits - 1 - Indexes))
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: Indexes == digits ? static_cast<Elem>('.')
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: Indexes < digits + 1 + sprout::detail::decimal_places_length ? sprout::detail::int_to_char<Elem>(sprout::detail::float_digit_at(val, digits - Indexes))
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: Indexes < digits + 1 + sprout::detail::decimal_places_length
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? sprout::detail::int_to_char<Elem>(sprout::detail::int_digit_at(v, digits + sprout::detail::decimal_places_length - Indexes))
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: Elem()
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)...
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},
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@ -57,6 +60,14 @@ namespace sprout {
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}
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;
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}
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template<typename Elem, typename FloatType>
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inline SPROUT_CONSTEXPR sprout::basic_string<Elem, sprout::printed_float_digits<FloatType>::value>
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float_to_string(FloatType val, bool negative, int digits) {
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return sprout::detail::float_to_string_impl<Elem>(
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val, negative, digits, static_cast<int>((val - sprout::floor(val)) * sprout::detail::int_pow<int>(sprout::detail::decimal_places_length)),
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sprout::index_range<0, sprout::printed_float_digits<FloatType>::value - 1>::make()
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);
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}
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} // namespace detail
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//
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@ -71,8 +82,7 @@ namespace sprout {
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return sprout::detail::float_to_string<Elem>(
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sprout::detail::float_round_at(val < 0 ? -val : val, sprout::detail::decimal_places_length),
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val < 0,
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sprout::detail::float_digits(val),
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sprout::index_range<0, sprout::printed_float_digits<FloatType>::value - 1>::make()
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sprout::detail::float_digits(val)
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);
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}
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