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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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1
sprout/string.hpp
View file

@ -16,5 +16,6 @@
#include <sprout/string/type_traits.hpp>
#include <sprout/string/alias.hpp>
#include <sprout/string/shrink.hpp>
#include <sprout/string/stretch.hpp>
#endif // #ifndef SPROUT_STRING_HPP

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]) {

28
sprout/type_traits/has_xxx.hpp
View file

@ -61,4 +61,32 @@
#define SPROUT_HAS_XXX_VALUE_DEF_LAZY(VALUE) \
SPROUT_HAS_XXX_VALUE_DEF(SPROUT_PP_CAT(has_, VALUE), VALUE)
//
// SPROUT_HAS_XXX_TEMPLATE_DEF
// SPROUT_HAS_XXX_TEMPLATE_DEF_LAZY
//
#if defined(_MSC_VER)
#define SPROUT_HAS_XXX_TEMPLATE_DEF(NAME, TEMPLATE) \
template<typename T, template<typename...> class = T::template TEMPLATE> \
std::true_type SPROUT_PP_CAT(SPROUT_PP_CAT(SPROUT_PP_CAT(sprout_has_xxx_impl_check_type_, TEMPLATE), NAME), __LINE__)(int); \
template<typename T> \
std::false_type SPROUT_PP_CAT(SPROUT_PP_CAT(SPROUT_PP_CAT(sprout_has_xxx_impl_check_type_, TEMPLATE), NAME), __LINE__)(long); \
template<typename T, typename Base_ = decltype(SPROUT_PP_CAT(SPROUT_PP_CAT(SPROUT_PP_CAT(sprout_has_xxx_impl_check_type_, TEMPLATE), NAME), __LINE__)<T>(0))> \
struct NAME \
: public Base_ \
{}
#else
#define SPROUT_HAS_XXX_TEMPLATE_DEF(NAME, TEMPLATE) \
template<typename T, template<typename...> class = T::template TEMPLATE> \
std::true_type SPROUT_PP_CAT(SPROUT_PP_CAT(SPROUT_PP_CAT(sprout_has_xxx_impl_check_type_, TEMPLATE), NAME), __LINE__)(int); \
template<typename T> \
std::false_type SPROUT_PP_CAT(SPROUT_PP_CAT(SPROUT_PP_CAT(sprout_has_xxx_impl_check_type_, TEMPLATE), NAME), __LINE__)(long); \
template<typename T> \
struct NAME \
: public decltype(SPROUT_PP_CAT(SPROUT_PP_CAT(SPROUT_PP_CAT(sprout_has_xxx_impl_check_type_, TEMPLATE), NAME), __LINE__)<T>(0)) \
{}
#endif
#define SPROUT_HAS_XXX_TEMPLATE_DEF_LAZY(TEMPLATE) \
SPROUT_HAS_XXX_TEMPLATE_DEF(SPROUT_PP_CAT(has_, TEMPLATE), TEMPLATE)
#endif // #ifndef SPROUT_TYPE_TRAITS_HAS_XXX_HPP

42
sprout/variant/apply_visitor.hpp
View file

@ -1,12 +1,52 @@
#ifndef SPROUT_VARIANT_APPLY_VISITOR_HPP
#define SPROUT_VARIANT_APPLY_VISITOR_HPP
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/utility/forward.hpp>
#include <sprout/type_traits/has_xxx.hpp>
namespace sprout {
//
// has_visitor_result
//
SPROUT_HAS_XXX_TEMPLATE_DEF_LAZY(visitor_result);
namespace detail {
template<typename Visitor, typename Visitable, typename = void>
struct visitor_result_impl;
template<typename Visitor, typename Visitable>
struct visitor_result_impl<
Visitor, Visitable,
typename std::enable_if<sprout::has_visitor_result<Visitable>::value>::type
>
: public Visitable::template visitor_result<Visitor, Visitable>
{};
template<typename Visitor, typename Visitable>
struct visitor_result_impl<
Visitor, Visitable,
typename std::enable_if<!sprout::has_visitor_result<Visitable>::value>::type
> {
public:
typedef typename Visitor::result_type type;
};
} // namespace detail
//
// visitor_result
//
template<typename Visitor, typename Visitable>
inline SPROUT_CONSTEXPR typename std::decay<Visitor>::type::result_type
struct visitor_result
: public sprout::detail::visitor_result_impl<Visitor, Visitable>
{};
//
// apply_visitor
//
template<typename Visitor, typename Visitable>
inline SPROUT_CONSTEXPR typename sprout::visitor_result<
typename std::remove_reference<Visitor>::type,
typename std::remove_reference<Visitable>::type
>::type
apply_visitor(Visitor&& visitor, Visitable&& visitable) {
return sprout::forward<Visitable>(visitable).apply_visitor(sprout::forward<Visitor>(visitor));
}

85
sprout/variant/variant.hpp
View file

@ -14,6 +14,8 @@
#include <sprout/tuple/functions.hpp>
#include <sprout/type/type_tuple.hpp>
#include <sprout/type/algorithm/find_index.hpp>
#include <sprout/functional/type_traits/has_type.hpp>
#include <sprout/functional/type_traits/weak_result_type.hpp>
namespace sprout {
template<typename... Types>
@ -72,6 +74,52 @@ namespace sprout {
typedef typename impl_type::uncvref_tuple_type uncvref_tuple_type;
public:
typedef typename impl_type::tuple_type tuple_type;
private:
template<typename Visitor, typename Tuple, typename IndexTuple>
struct visitor_result_impl_1;
template<typename Visitor, typename Tuple, sprout::index_t... Indexes>
struct visitor_result_impl_1<Visitor, Tuple, sprout::index_tuple<Indexes...> > {
public:
typedef typename std::decay<
typename std::common_type<
decltype((std::declval<Visitor>())(sprout::tuples::get<Indexes>(std::declval<Tuple>())))...
>::type
>::type type;
};
template<typename Visitor, typename Tuple, typename = void>
struct visitor_result_impl;
template<typename Visitor, typename Tuple>
struct visitor_result_impl<
Visitor, Tuple,
typename std::enable_if<!sprout::has_result_type<sprout::weak_result_type<Visitor> >::value>::type
>
: public visitor_result_impl_1<Visitor, Tuple, typename sprout::index_range<0, sprout::tuples::tuple_size<Tuple>::value>::type>
{};
template<typename Visitor, typename Tuple>
struct visitor_result_impl<
Visitor, Tuple,
typename std::enable_if<sprout::has_result_type<sprout::weak_result_type<Visitor> >::value>::type
> {
public:
typedef typename sprout::weak_result_type<Visitor>::result_type type;
};
public:
template<typename Visitor, typename Visitable>
struct visitor_result
: public visitor_result_impl<Visitor, typename Visitable::tuple_type>
{};
template<typename Visitor, typename Visitable>
struct visitor_result<Visitor, Visitable const>
: public visitor_result_impl<Visitor, typename Visitable::tuple_type const>
{};
template<typename Visitor, typename Visitable>
struct visitor_result<Visitor, Visitable volatile>
: public visitor_result_impl<Visitor, typename Visitable::tuple_type volatile>
{};
template<typename Visitor, typename Visitable>
struct visitor_result<Visitor, Visitable const volatile>
: public visitor_result_impl<Visitor, typename Visitable::tuple_type const volatile>
{};
private:
template<int I>
static SPROUT_CONSTEXPR typename std::enable_if<
@ -124,21 +172,24 @@ namespace sprout {
: output<I + 1>(os, t, which)
;
}
template<int I, typename Tuple, typename Visitor>
template<typename Result, int I, typename Tuple, typename Visitor>
static SPROUT_CONSTEXPR typename std::enable_if<
I == sizeof...(Types),
typename std::decay<Visitor>::type::result_type
>::type visit(Tuple&& t, Visitor&& v, int which) {
return typename std::decay<Visitor>::type::result_type();
}
template<int I, typename Tuple, typename Visitor>
static SPROUT_CONSTEXPR typename std::enable_if<
I != sizeof...(Types),
typename std::decay<Visitor>::type::result_type
I == sizeof...(Types) - 1,
Result
>::type visit(Tuple&& t, Visitor&& v, int which) {
return I == which
? sprout::forward<Visitor>(v)(sprout::tuples::get<I>(sprout::forward<Tuple>(t)))
: visit<I + 1>(sprout::forward<Tuple>(t), sprout::forward<Visitor>(v), which)
: throw std::domain_error("variant<>: bad visit")
;
}
template<typename Result, int I, typename Tuple, typename Visitor>
static SPROUT_CONSTEXPR typename std::enable_if<
I != sizeof...(Types) - 1,
Result
>::type visit(Tuple&& t, Visitor&& v, int which) {
return I == which
? sprout::forward<Visitor>(v)(sprout::tuples::get<I>(sprout::forward<Tuple>(t)))
: visit<Result, I + 1>(sprout::forward<Tuple>(t), sprout::forward<Visitor>(v), which)
;
}
private:
@ -249,12 +300,16 @@ namespace sprout {
}
// visitation support
template<typename Visitor>
SPROUT_CONSTEXPR typename std::decay<Visitor>::type::result_type apply_visitor(Visitor&& visitor) const {
return visit<0>(tuple_, sprout::forward<Visitor>(visitor), which_);
SPROUT_CONSTEXPR typename visitor_result<typename std::remove_reference<Visitor>::type, variant const>::type
apply_visitor(Visitor&& visitor) const {
typedef typename visitor_result<typename std::remove_reference<Visitor>::type, variant const>::type result_type;
return visit<result_type, 0>(tuple_, sprout::forward<Visitor>(visitor), which_);
}
template<typename Visitor>
typename std::decay<Visitor>::type::result_type apply_visitor(Visitor&& visitor) {
return visit<0>(tuple_, sprout::forward<Visitor>(visitor), which_);
typename visitor_result<typename std::remove_reference<Visitor>::type, variant>::type
apply_visitor(Visitor&& visitor) {
typedef typename visitor_result<typename std::remove_reference<Visitor>::type, variant>::type result_type;
return visit<result_type, 0>(tuple_, sprout::forward<Visitor>(visitor), which_);
}
};