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// Copyright 2017, 2021 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>
#include <string>
#include <cerrno>
using namespace boost::system;
struct X
{
static int instances;
int v_;
X(): v_() { ++instances; }
explicit X( int v ): v_( v ) { ++instances; }
X( int v1, int v2 ): v_( v1+v2 ) { ++instances; }
X( int v1, int v2, int v3 ): v_( v1+v2+v3 ) { ++instances; }
X( X const& r ): v_( r.v_ ) { ++instances; }
X& operator=( X const& ) = delete;
~X() { --instances; }
};
int X::instances = 0;
int main()
{
{
auto ec = make_error_code( errc::invalid_argument );
result<int&> r( ec );
BOOST_TEST( !r.has_value() );
BOOST_TEST( r.has_error() );
BOOST_TEST_EQ( r.error(), ec );
}
{
auto ec = make_error_code( errc::invalid_argument );
result<int&> r = ec;
BOOST_TEST( !r.has_value() );
BOOST_TEST( r.has_error() );
BOOST_TEST_EQ( r.error(), ec );
}
{
result<int&> r( EINVAL, generic_category() );
BOOST_TEST( !r.has_value() );
BOOST_TEST( r.has_error() );
BOOST_TEST_EQ( r.error(), error_code( EINVAL, generic_category() ) );
}
{
auto ec = make_error_code( errc::invalid_argument );
result<error_code&> r( in_place_error, ec );
BOOST_TEST( !r.has_value() );
BOOST_TEST( r.has_error() );
BOOST_TEST_EQ( r.error(), ec );
}
{
result<error_code&> r( in_place_error, EINVAL, generic_category() );
BOOST_TEST( !r.has_value() );
BOOST_TEST( r.has_error() );
BOOST_TEST_EQ( r.error(), error_code( EINVAL, generic_category() ) );
}
BOOST_TEST_EQ( X::instances, 0 );
{
result<std::string&, X> r( 1 );
BOOST_TEST( !r.has_value() );
BOOST_TEST( r.has_error() );
BOOST_TEST_EQ( r.error().v_, 1 );
BOOST_TEST_EQ( X::instances, 1 );
}
BOOST_TEST_EQ( X::instances, 0 );
{
result<int&, X> r( 1, 2 );
BOOST_TEST( !r.has_value() );
BOOST_TEST( r.has_error() );
BOOST_TEST_EQ( r.error().v_, 1+2 );
BOOST_TEST_EQ( X::instances, 1 );
}
BOOST_TEST_EQ( X::instances, 0 );
{
result<int&, X> r( 1, 2, 3 );
BOOST_TEST( !r.has_value() );
BOOST_TEST( r.has_error() );
BOOST_TEST_EQ( r.error().v_, 1+2+3 );
BOOST_TEST_EQ( X::instances, 1 );
}
BOOST_TEST_EQ( X::instances, 0 );
{
result<X&, X> r( in_place_error, 1 );
BOOST_TEST( !r.has_value() );
BOOST_TEST( r.has_error() );
BOOST_TEST_EQ( r.error().v_, 1 );
BOOST_TEST_EQ( X::instances, 1 );
}
BOOST_TEST_EQ( X::instances, 0 );
{
BOOST_TEST_TRAIT_TRUE((std::is_constructible<result<int&>, error_code>));
BOOST_TEST_TRAIT_TRUE((std::is_convertible<error_code, result<int&>>));
BOOST_TEST_TRAIT_TRUE((std::is_constructible<result<std::string&, X>, int>));
BOOST_TEST_TRAIT_FALSE((std::is_convertible<int, result<std::string&, X>>));
BOOST_TEST_TRAIT_TRUE((std::is_constructible<result<int&, X>, int>));
BOOST_TEST_TRAIT_FALSE((std::is_convertible<int, result<int&, X>>));
// There's an ambiguity here between int& and X, but since is_convertible
// is true, is_constructible can't be false.
// BOOST_TEST_TRAIT_FALSE((std::is_constructible<result<int&, X>, int&>));
BOOST_TEST_TRAIT_TRUE((std::is_convertible<int&, result<int&, X>>));
}
return boost::report_errors();
}
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