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move support: optional class template

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bolero-MURAKAMI 2013-05-18 21:37:54 +09:00
parent d732a73431
commit e6420f2bbd
3 changed files with 130 additions and 71 deletions
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27
sprout/utility/value_holder/value_holder.hpp
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@ -3,6 +3,7 @@
#include <sprout/config.hpp>
#include <sprout/utility/swap.hpp>
#include <sprout/utility/move.hpp>
namespace sprout {
namespace detail {
@ -17,11 +18,15 @@ namespace sprout {
typedef T const* const_pointer;
typedef T const* mutable_or_const_pointer;
typedef T const& param_type;
typedef T&& movable_param_type;
typedef T holder_type;
public:
static SPROUT_CONSTEXPR holder_type const& hold(param_type p) SPROUT_NOEXCEPT {
return p;
}
static SPROUT_CONSTEXPR holder_type&& hold(movable_param_type p) SPROUT_NOEXCEPT {
return sprout::move(p);
}
static SPROUT_CONSTEXPR reference ref(holder_type& r) {
return r;
}
@ -46,10 +51,14 @@ namespace sprout {
typedef T const* const_pointer;
typedef T const* mutable_or_const_pointer;
typedef T const& param_type;
typedef T const&& movable_param_type;
typedef T holder_type;
public:
static SPROUT_CONSTEXPR holder_type const& hold(param_type p) SPROUT_NOEXCEPT {
return &p;
return p;
}
static SPROUT_CONSTEXPR holder_type const&& hold(movable_param_type p) SPROUT_NOEXCEPT {
return sprout::move(p);
}
static SPROUT_CONSTEXPR reference ref(holder_type& r) {
return *r;
@ -75,6 +84,7 @@ namespace sprout {
typedef T const* const_pointer;
typedef T* mutable_or_const_pointer;
typedef T& param_type;
typedef T&& movable_param_type;
typedef T* holder_type;
public:
static SPROUT_CONSTEXPR holder_type hold(param_type p) SPROUT_NOEXCEPT {
@ -98,6 +108,7 @@ namespace sprout {
typedef T const* const_pointer;
typedef T const* mutable_or_const_pointer;
typedef T const& param_type;
typedef T const&& movable_param_type;
typedef T const* holder_type;
public:
static SPROUT_CONSTEXPR holder_type hold(param_type p) SPROUT_NOEXCEPT {
@ -130,11 +141,13 @@ namespace sprout {
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;
typedef typename helper_type::movable_param_type movable_param_type;
typedef reference reference_type;
typedef mutable_or_const_reference reference_const_type;
typedef pointer pointer_type;
typedef mutable_or_const_pointer pointer_const_type;
typedef param_type argument_type;
typedef movable_param_type movable_argument_type;
private:
holder_type holder_;
public:
@ -142,13 +155,23 @@ namespace sprout {
: holder_()
{}
SPROUT_CONSTEXPR value_holder(value_holder const&) = default;
SPROUT_CONSTEXPR value_holder(value_holder&&) = default;
explicit SPROUT_CONSTEXPR value_holder(param_type p)
: holder_(helper_type::hold(p))
{}
explicit SPROUT_CONSTEXPR value_holder(movable_argument_type p)
: holder_(helper_type::hold(sprout::move(p)))
{}
value_holder& operator=(value_holder const&) = default;
value_holder& operator=(value_holder&&) = default;
value_holder& operator=(param_type p) {
value_holder temp(p);
value_holder temp(helper_type::hold(p));
temp.swap(p);
return *this;
}
value_holder& operator=(movable_argument_type p) {
value_holder temp(helper_type::hold(sprout::move(p)));
temp.swap(p);
return *this;
}