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Add constexpr support to empty_value

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This commit is contained in:
Glen Fernandes
2022-08-06 18:53:40 -04:00
parent 4162dbed57
commit e3745b2072
3 changed files with 82 additions and 16 deletions
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32
include/boost/core/empty_value.hpp
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@@ -56,37 +56,37 @@ public:
#if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS)
empty_value() = default;
#else
empty_value() { }
BOOST_CONSTEXPR empty_value() { }
#endif
empty_value(boost::empty_init_t)
BOOST_CONSTEXPR empty_value(boost::empty_init_t)
: value_() { }
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
template<class U, class... Args>
empty_value(boost::empty_init_t, U&& value, Args&&... args)
BOOST_CONSTEXPR empty_value(boost::empty_init_t, U&& value, Args&&... args)
: value_(std::forward<U>(value), std::forward<Args>(args)...) { }
#else
template<class U>
empty_value(boost::empty_init_t, U&& value)
BOOST_CONSTEXPR empty_value(boost::empty_init_t, U&& value)
: value_(std::forward<U>(value)) { }
#endif
#else
template<class U>
empty_value(boost::empty_init_t, const U& value)
BOOST_CONSTEXPR empty_value(boost::empty_init_t, const U& value)
: value_(value) { }
template<class U>
empty_value(boost::empty_init_t, U& value)
BOOST_CONSTEXPR empty_value(boost::empty_init_t, U& value)
: value_(value) { }
#endif
const T& get() const BOOST_NOEXCEPT {
BOOST_CONSTEXPR const T& get() const BOOST_NOEXCEPT {
return value_;
}
T& get() BOOST_NOEXCEPT {
BOOST_CXX14_CONSTEXPR T& get() BOOST_NOEXCEPT {
return value_;
}
@@ -104,37 +104,37 @@ public:
#if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS)
empty_value() = default;
#else
empty_value() { }
BOOST_CONSTEXPR empty_value() { }
#endif
empty_value(boost::empty_init_t)
BOOST_CONSTEXPR empty_value(boost::empty_init_t)
: T() { }
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
template<class U, class... Args>
empty_value(boost::empty_init_t, U&& value, Args&&... args)
BOOST_CONSTEXPR empty_value(boost::empty_init_t, U&& value, Args&&... args)
: T(std::forward<U>(value), std::forward<Args>(args)...) { }
#else
template<class U>
empty_value(boost::empty_init_t, U&& value)
BOOST_CONSTEXPR empty_value(boost::empty_init_t, U&& value)
: T(std::forward<U>(value)) { }
#endif
#else
template<class U>
empty_value(boost::empty_init_t, const U& value)
BOOST_CONSTEXPR empty_value(boost::empty_init_t, const U& value)
: T(value) { }
template<class U>
empty_value(boost::empty_init_t, U& value)
BOOST_CONSTEXPR empty_value(boost::empty_init_t, U& value)
: T(value) { }
#endif
const T& get() const BOOST_NOEXCEPT {
BOOST_CONSTEXPR const T& get() const BOOST_NOEXCEPT {
return *this;
}
T& get() BOOST_NOEXCEPT {
BOOST_CXX14_CONSTEXPR T& get() BOOST_NOEXCEPT {
return *this;
}
};