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added o.map()

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This commit is contained in:
Andrzej Krzemienski
2018-06-23 18:27:14 +02:00
parent 5182f7f30f
commit e47a017009
50 changed files with 343 additions and 91 deletions
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51
include/boost/optional/optional.hpp
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@ -1,5 +1,5 @@
// Copyright (C) 2003, 2008 Fernando Luis Cacciola Carballal.
// Copyright (C) 2014 - 2017 Andrzej Krzemienski.
// Copyright (C) 2014 - 2018 Andrzej Krzemienski.
//
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
@ -53,6 +53,7 @@
#include <boost/move/utility.hpp>
#include <boost/none.hpp>
#include <boost/utility/compare_pointees.hpp>
#include <boost/utility/result_of.hpp>
#include <boost/optional/optional_fwd.hpp>
#include <boost/optional/detail/optional_config.hpp>
@ -1304,7 +1305,7 @@ class optional
#endif
#ifndef BOOST_NO_CXX11_REF_QUALIFIERS
#if (!defined BOOST_NO_CXX11_REF_QUALIFIERS) && (!defined BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES)
template <typename F>
value_type value_or_eval ( F f ) const&
{
@ -1322,6 +1323,34 @@ class optional
else
return f();
}
template <typename F>
optional<typename boost::result_of<F(reference_type)>::type> map(F f) &
{
if (this->has_value())
return f(get());
else
return none;
}
template <typename F>
optional<typename boost::result_of<F(reference_const_type)>::type> map(F f) const&
{
if (this->has_value())
return f(get());
else
return none;
}
template <typename F>
optional<typename boost::result_of<F(reference_type_of_temporary_wrapper)>::type> map(F f) &&
{
if (this->has_value())
return f(boost::move(this->get()));
else
return none;
}
#else
template <typename F>
value_type value_or_eval ( F f ) const
@ -1331,6 +1360,24 @@ class optional
else
return f();
}
template <typename F>
optional<typename boost::result_of<F(reference_type)>::type> map(F f)
{
if (this->has_value())
return f(get());
else
return none;
}
template <typename F>
optional<typename boost::result_of<F(reference_const_type)>::type> map(F f) const
{
if (this->has_value())
return f(get());
else
return none;
}
#endif
bool has_value() const BOOST_NOEXCEPT { return this->is_initialized() ; }