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// Copyright 2018-2022 Emil Dotchevski and Reverge Studios, Inc.
// Distributed under 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)
#ifdef BOOST_LEAF_TEST_SINGLE_HEADER
# include "leaf.hpp"
#else
# include <boost/leaf/result.hpp>
# include <boost/leaf/handle_errors.hpp>
#endif
#include "lightweight_test.hpp"
#ifdef BOOST_LEAF_BOOST_AVAILABLE
# include <boost/config/workaround.hpp>
#else
# define BOOST_WORKAROUND(a,b) 0
#endif
namespace leaf = boost::leaf;
struct value
{
int x;
explicit value( int x_ ): x(x_) { };
#ifndef BOOST_LEAF_NO_CXX11_REF_QUALIFIERS
value( value const & ) = delete;
value( value && ) = default;
#endif
};
leaf::result<value> f1()
{
return value { 21 };
}
leaf::result<value> f2()
{
BOOST_LEAF_AUTO(a, f1());
#if BOOST_WORKAROUND( BOOST_GCC, < 50000 ) || BOOST_WORKAROUND( BOOST_CLANG, <= 30800 )
return std::move(a); // Older compilers are confused, but...
#else
return a; // ...this doesn't need to be return std::move(a);
#endif
}
template <class Lambda>
leaf::result<value> f2_lambda( Lambda )
{
BOOST_LEAF_AUTO(a, f1());
#if BOOST_WORKAROUND( BOOST_GCC, < 50000 ) || BOOST_WORKAROUND( BOOST_CLANG, <= 30800 )
return std::move(a); // Older compilers are confused, but...
#else
return a; // ...this doesn't need to be return std::move(a);
#endif
}
leaf::result<value> f3()
{
BOOST_LEAF_AUTO(a, f2());
// Invoking the macro twice in the same scope, testing the temp name
// generation. Also making sure we can pass a lambda (See
// https://github.com/boostorg/leaf/issues/16).
BOOST_LEAF_AUTO(b, f2_lambda([]{}));
return value { a.x + b.x };
}
int main()
{
BOOST_TEST_EQ(f3()->x, 42);
{
int r = leaf::try_handle_all(
[]() -> leaf::result<int>
{
int x = 42;
leaf::result<int> r1(x);
BOOST_LEAF_AUTO(rx1, r1);
BOOST_TEST_EQ(r1.value(), rx1);
leaf::result<int &> r2(x);
BOOST_LEAF_AUTO(rx2, r2);
BOOST_TEST_EQ(r2.value(), rx2);
return 0;
},
[]
{
return 1;
} );
BOOST_TEST_EQ(r, 0);
}
return boost::report_errors();
}
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