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// Copyright Catch2 Authors
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.txt or copy at
// https://www.boost.org/LICENSE_1_0.txt)
// SPDX-License-Identifier: BSL-1.0
#include <catch2/internal/catch_compiler_capabilities.hpp>
#if defined( CATCH_INTERNAL_CONSTEXPR_MATCHERS_ENABLED )
#include <catch2/catch_test_macros.hpp>
#include <catch2/matchers/catch_matchers_templated.hpp>
#include <catch2/matchers/catch_matchers_container_properties.hpp>
#include <catch2/matchers/catch_matchers_quantifiers.hpp>
#include <array>
namespace {
struct MatchAllMatcher final : public Catch::Matchers::MatcherGenericBase {
public:
template <typename Any>
constexpr bool match( Any&& ) const {
return true;
}
std::string describe() const override {
using namespace std::string_literals;
return "Matches anything"s;
}
};
constexpr MatchAllMatcher MatchAll() { return MatchAllMatcher(); }
struct MatchTrueMatcher final : public Catch::Matchers::MatcherGenericBase {
public:
constexpr bool match( bool b ) const {
return b;
}
std::string describe() const override {
using namespace std::string_literals;
return "Matches true"s;
}
};
constexpr MatchTrueMatcher MatchTrue() { return MatchTrueMatcher(); }
} // namespace
TEST_CASE( "Constexpr support for matchers", "[constexpr][matchers][approvals]" ) {
STATIC_REQUIRE( MatchAll().match( 1 ) );
STATIC_REQUIRE_THAT( 1, MatchAll() );
}
TEST_CASE( "IsEmpty and HasSize matchers can be used in constexpr contexts",
"[constexpr][matchers][approvals]" ){
using namespace Catch::Matchers;
static constexpr std::array<int, 0> empty{};
STATIC_REQUIRE_THAT( empty, IsEmpty() );
static constexpr int arr[1] = { 2 };
STATIC_REQUIRE_THAT( arr, SizeIs( 1 ) );
STATIC_REQUIRE_THAT( arr, SizeIs( MatchAll() ) );
}
constexpr std::array<bool, 3> compute_bools( int type ) {
switch ( type ) {
case 0:
return { true, true, true };
case 1:
return { false, true, false };
case 2:
return { false, false, false };
default:
return { false, false, false };
}
}
TEST_CASE( "Quantifier matchers can be used in constexpr contexts",
"[constexpr][matchers][approvals]" ) {
using namespace Catch::Matchers;
STATIC_REQUIRE_THAT( compute_bools( 0 ), AllTrue() );
STATIC_REQUIRE_THAT( compute_bools( 1 ), AnyTrue() );
STATIC_REQUIRE_THAT( compute_bools( 2 ), NoneTrue() );
STATIC_REQUIRE_THAT( compute_bools( 0 ), AllMatch( MatchTrue() ) );
STATIC_REQUIRE_THAT( compute_bools( 1 ), AnyMatch( MatchTrue() ) );
STATIC_REQUIRE_THAT( compute_bools( 2 ), NoneMatch( MatchTrue() ) );
}
// Combining matchers needs C++26 and P2738, so they are in separate preprocessor block
# if __cpp_constexpr >= 202306L
TEST_CASE("Constexpr support for combining matchers",
"[constexpr][matchers][approvals]") {
STATIC_REQUIRE( ( MatchAll() && MatchAll() ).match( 1 ) );
STATIC_REQUIRE( ( MatchAll() || MatchAll() ).match( 1 ) );
STATIC_REQUIRE( ( !!MatchAll() ).match( 1 ) );
STATIC_REQUIRE_THAT( 1, MatchAll() && MatchAll() );
STATIC_REQUIRE_THAT( 1, MatchAll() || MatchAll() );
STATIC_REQUIRE_THAT( 1, !!MatchAll() );
}
#endif // __cpp_constexpr >= 202306L
#endif
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