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Added function value_or()

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Andrzej Krzemienski
2014-05-23 16:38:42 +02:00
parent 75271b73a8
commit 3984c9f9a1
7 changed files with 100 additions and 18 deletions
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0
include/boost/bad_optional_access.hpp → include/boost/optional/bad_optional_access.hpp
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14
include/boost/optional/optional.hpp
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@ -23,7 +23,7 @@
#include <boost/config.hpp>
#include <boost/assert.hpp>
#include <boost/bad_optional_access.hpp>
#include <boost/optional/bad_optional_access.hpp>
#include <boost/static_assert.hpp>
#include <boost/throw_exception.hpp>
#include <boost/type.hpp>
@ -441,11 +441,11 @@ class optional_base : public optional_tag
public :
// Destroys the current value, if any, leaving this UNINITIALIZED
// **DEPPRECATED** Destroys the current value, if any, leaving this UNINITIALIZED
// No-throw (assuming T::~T() doesn't)
void reset() BOOST_NOEXCEPT { destroy(); }
// Replaces the current value -if any- with 'val'
// **DEPPRECATED** Replaces the current value -if any- with 'val'
void reset ( argument_type val ) { assign(val); }
// Returns a pointer to the value if this is initialized, otherwise,
@ -954,6 +954,14 @@ class optional : public optional_detail::optional_base<T>
throw_exception(bad_optional_access("Attempted to access the value of an uninitialized optional object."));
}
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
template <class U>
value_type value_or ( U&& v ) const { return this->is_initialized() ? get() : static_cast<value_type>(boost::forward<U>(v)); }
#else
template <class U>
value_type value_or ( U const& v ) const { return this->is_initialized() ? get() : static_cast<value_type>(v); }
#endif
bool operator!() const BOOST_NOEXCEPT { return !this->is_initialized() ; }
BOOST_EXPLICIT_OPERATOR_BOOL()