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// Copyright 2017, 2021, 2023 Peter Dimov.
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/system/result.hpp>
#include <boost/core/lightweight_test.hpp>
#include <boost/core/lightweight_test_trait.hpp>
using namespace boost::system;
struct X
{
static int instances;
int v_;
explicit X( int v ): v_( v ) { ++instances; }
X( X const& ) = delete;
X& operator=( X const& ) = delete;
~X() { --instances; }
};
int X::instances = 0;
int main()
{
{
int x = 0;
result<int&> r( x );
BOOST_TEST( r.has_value() );
BOOST_TEST( !r.has_error() );
BOOST_TEST_EQ( r.value(), 0 );
}
{
int x = 0;
result<int&> r = x;
BOOST_TEST( r.has_value() );
BOOST_TEST( !r.has_error() );
BOOST_TEST_EQ( r.value(), 0 );
}
{
int x = 1;
result<int&, int> r( in_place_value, x );
BOOST_TEST( r.has_value() );
BOOST_TEST( !r.has_error() );
BOOST_TEST_EQ( *r, 1 );
}
BOOST_TEST_EQ( X::instances, 0 );
{
X x( 1 );
result<X&> r( x );
BOOST_TEST( r.has_value() );
BOOST_TEST( !r.has_error() );
BOOST_TEST_EQ( r.value().v_, 1 );
BOOST_TEST_EQ( X::instances, 1 );
}
BOOST_TEST_EQ( X::instances, 0 );
{
X x( 1 );
result<X&> r = x;
BOOST_TEST( r.has_value() );
BOOST_TEST( !r.has_error() );
BOOST_TEST_EQ( r.value().v_, 1 );
BOOST_TEST_EQ( X::instances, 1 );
}
BOOST_TEST_EQ( X::instances, 0 );
{
X x( 1 );
result<X&, X> r( in_place_value, x );
BOOST_TEST( r.has_value() );
BOOST_TEST( !r.has_error() );
BOOST_TEST_EQ( r->v_, 1 );
BOOST_TEST_EQ( X::instances, 1 );
}
BOOST_TEST_EQ( X::instances, 0 );
{
BOOST_TEST_TRAIT_TRUE((std::is_constructible<result<int&>, int&>));
BOOST_TEST_TRAIT_TRUE((std::is_convertible<int&, result<int&>>));
BOOST_TEST_TRAIT_FALSE((std::is_constructible<result<int&>, int const&>));
BOOST_TEST_TRAIT_FALSE((std::is_convertible<int const&, result<int&>>));
BOOST_TEST_TRAIT_FALSE((std::is_constructible<result<int&>, int>));
BOOST_TEST_TRAIT_FALSE((std::is_convertible<int, result<int&>>));
BOOST_TEST_TRAIT_FALSE((std::is_constructible<result<int&, int>, int&>));
BOOST_TEST_TRAIT_FALSE((std::is_constructible<result<int&, float>, int&>));
BOOST_TEST_TRAIT_FALSE((std::is_constructible<result<X&>, int>));
BOOST_TEST_TRAIT_FALSE((std::is_convertible<int, result<X&>>));
}
return boost::report_errors();
}
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