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null_array 追加

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bolero-MURAKAMI 2011-10-06 21:45:01 +09:00
parent a52257117e
commit 6ae26b7470
7 changed files with 680 additions and 11 deletions
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160
sprout/utility/value_holder.hpp Normal file
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#ifndef SPROUT_UTILITY_VALUE_HOLDER_HPP
#define SPROUT_UTILITY_VALUE_HOLDER_HPP
#include <sprout/config.hpp>
namespace sprout {
namespace detail {
template<typename T>
struct holder_helper {
public:
typedef T value_type;
typedef T& reference;
typedef T const& const_reference;
typedef T const& mutable_or_const_reference;
typedef T* pointer;
typedef T const* const_pointer;
typedef T const* mutable_or_const_pointer;
typedef T const& param_type;
typedef T holder_type;
public:
static SPROUT_CONSTEXPR holder_type const& hold(param_type p) {
return p;
}
static SPROUT_CONSTEXPR reference ref(holder_type& r) {
return r;
}
static SPROUT_CONSTEXPR const_reference ref(holder_type const& r) {
return r;
}
static SPROUT_CONSTEXPR pointer ptr(holder_type& r) {
return &r;
}
static SPROUT_CONSTEXPR const_pointer ptr(holder_type const& r) {
return &r;
}
};
template<typename T>
struct holder_helper<T const> {
public:
typedef T value_type;
typedef T const& reference;
typedef T const& const_reference;
typedef T const& mutable_or_const_reference;
typedef T const* pointer;
typedef T const* const_pointer;
typedef T const* mutable_or_const_pointer;
typedef T const& param_type;
typedef T holder_type;
public:
static SPROUT_CONSTEXPR holder_type const& hold(param_type p) {
return &p;
}
static SPROUT_CONSTEXPR reference ref(holder_type& r) {
return *r;
}
static SPROUT_CONSTEXPR const_reference ref(holder_type const& r) {
return *r;
}
static SPROUT_CONSTEXPR pointer ptr(holder_type& r) {
return &r;
}
static SPROUT_CONSTEXPR const_pointer ptr(holder_type const& r) {
return &r;
}
};
template<typename T>
struct holder_helper<T&> {
public:
typedef T value_type;
typedef T& reference;
typedef T const& const_reference;
typedef T& mutable_or_const_reference;
typedef T* pointer;
typedef T const* const_pointer;
typedef T* mutable_or_const_pointer;
typedef T& param_type;
typedef T* holder_type;
public:
static SPROUT_CONSTEXPR holder_type hold(param_type p) {
return &p;
}
static SPROUT_CONSTEXPR reference ref(holder_type r) {
return *r;
}
static SPROUT_CONSTEXPR pointer ptr(holder_type r) {
return r;
}
};
template<typename T>
struct holder_helper<T const&> {
public:
typedef T value_type;
typedef T const& reference;
typedef T const& const_reference;
typedef T const& mutable_or_const_reference;
typedef T const* pointer;
typedef T const* const_pointer;
typedef T const* mutable_or_const_pointer;
typedef T const& param_type;
typedef T const* holder_type;
public:
static SPROUT_CONSTEXPR holder_type hold(param_type p) {
return &p;
}
static SPROUT_CONSTEXPR reference ref(holder_type r) {
return *r;
}
static SPROUT_CONSTEXPR pointer ptr(holder_type r) {
return r;
}
};
} // namespace detail
//
// value_holder
//
template<typename T>
class value_holder {
public:
typedef T type;
private:
typedef sprout::detail::holder_helper<type> helper_type;
typedef typename helper_type::holder_type holder_type;
public:
typedef typename helper_type::value_type value_type;
typedef typename helper_type::reference reference;
typedef typename helper_type::const_reference const_reference;
typedef typename helper_type::mutable_or_const_reference mutable_or_const_reference;
typedef typename helper_type::pointer pointer;
typedef typename helper_type::const_pointer const_pointer;
typedef typename helper_type::mutable_or_const_pointer mutable_or_const_pointer;
typedef typename helper_type::param_type param_type;
private:
holder_type holder_;
public:
value_holder() = default;
SPROUT_CONSTEXPR explicit value_holder(param_type p)
: holder_(helper_type::hold(p))
{}
operator reference() {
return helper_type::ref(holder_);
}
SPROUT_CONSTEXPR operator const_reference() const {
return helper_type::ref(holder_);
}
reference get() {
return helper_type::ref(holder_);
}
SPROUT_CONSTEXPR mutable_or_const_reference get() const {
return helper_type::ref(holder_);
}
pointer get_pointer() {
return helper_type::ptr(holder_);
}
SPROUT_CONSTEXPR mutable_or_const_pointer get_pointer() const {
return helper_type::ptr(holder_);
}
};
} // namespace sprout
#endif // #ifndef SPROUT_UTILITY_VALUE_HOLDER_HPP