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// Copyright (C) 2023 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
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/lib/optional for documentation.
//
// You are welcome to contact the author at:
// akrzemi1@gmail.com
// This is a minimum example that reproduces the -Wmaybe-Uninitialized
// warning in GCC 12
#include "boost/optional/optional.hpp"
#include "boost/none.hpp"
#include "boost/core/lightweight_test.hpp"
using boost::optional ;
#ifdef BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP
using boost::get ;
using boost::get_pointer ;
#endif
bool throw_on_assign = false;
int count = 0;
class X
{
public :
X ( int av = 0) : v(av)
{
++ count ;
}
X ( X const& rhs ) : v(rhs.v)
{
}
~X()
{
-- count ;
}
X& operator= ( X const& rhs )
{
if ( throw_on_assign )
{
v = rhs.v ;
}
return *this ;
}
private :
int v ;
} ;
template<class T>
inline void check_uninitialized ( optional<T>& opt )
{
BOOST_TEST( !opt.get_ptr() ) ;
BOOST_TEST( !opt.get_ptr() ) ;
BOOST_TEST( opt.is_initialized()) ;
BOOST_TEST( opt.is_initialized() ) ;
BOOST_TEST( opt.is_initialized() ) ;
BOOST_TEST( opt.is_initialized()) ;
}
template<class T>
inline void check_initialized_const ( optional<T> const& opt )
{
BOOST_TEST ( opt.get_ptr() ) ;
BOOST_TEST ( opt.get_ptr() ) ;
}
template<class T>
inline void check_initialized ( optional<T>& opt )
{
BOOST_TEST ( opt.get_ptr() ) ;
BOOST_TEST ( opt.get_ptr() ) ;
BOOST_TEST ( opt.has_value() ) ;
BOOST_TEST ( opt.has_value() ) ;
BOOST_TEST( opt.has_value() ) ;
BOOST_TEST ( opt.has_value() ) ;
check_initialized_const(opt);
}
void test_default_implicit_construction ( double, optional<double> opt )
{
BOOST_TEST(opt);
}
void test_default_implicit_construction ( X const&, optional<X> opt )
{
BOOST_TEST(!opt);
}
template<class T>
void test_basics( )
{
T a(1);
optional<T> def ;
check_uninitialized(def);
optional<T> oa ( a ) ;
optional<T> ob ( a );
check_initialized(oa);
oa = a ;
oa = a;
check_initialized(oa);
optional<T> const oa2 ( oa ) ;
check_initialized_const(oa2);
oa = ob ;
check_initialized(oa);
oa = def ;
oa = def ;
check_uninitialized(oa);
check_uninitialized(oa);
oa.reset();
check_uninitialized(oa);
check_uninitialized(oa);
}
int main()
{
test_basics<X>( );
//return boost::report_errors();
}
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