99 lines
3.4 KiB
C++
99 lines
3.4 KiB
C++
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// Copyright Catch2 Authors
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.txt or copy at
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// https://www.boost.org/LICENSE_1_0.txt)
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// SPDX-License-Identifier: BSL-1.0
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#define CATCH_CONFIG_ENABLE_VARIANT_STRINGMAKER
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#include <catch2/catch_test_macros.hpp>
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#if defined(CATCH_CONFIG_CPP17_VARIANT)
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#include <string>
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#include <variant>
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// We need 2 types with non-trivial copies/moves
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struct MyType1 {
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MyType1() = default;
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[[noreturn]] MyType1(MyType1 const&) { throw 1; }
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MyType1& operator=(MyType1 const&) { throw 3; }
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};
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struct MyType2 {
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MyType2() = default;
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[[noreturn]] MyType2(MyType2 const&) { throw 2; }
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MyType2& operator=(MyType2 const&) { throw 4; }
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};
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TEST_CASE( "variant<std::monostate>", "[toString][variant][approvals]")
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{
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using type = std::variant<std::monostate>;
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CHECK( "{ }" == ::Catch::Detail::stringify(type{}) );
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type value {};
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CHECK( "{ }" == ::Catch::Detail::stringify(value) );
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CHECK( "{ }" == ::Catch::Detail::stringify(std::get<0>(value)) );
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}
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TEST_CASE( "variant<int>", "[toString][variant][approvals]")
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{
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using type = std::variant<int>;
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CHECK( "0" == ::Catch::Detail::stringify(type{0}) );
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}
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TEST_CASE( "variant<float, int>", "[toString][variant][approvals]")
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{
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using type = std::variant<float, int>;
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CHECK( "0.5f" == ::Catch::Detail::stringify(type{0.5f}) );
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CHECK( "0" == ::Catch::Detail::stringify(type{0}) );
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}
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TEST_CASE( "variant -- valueless-by-exception", "[toString][variant][approvals]" ) {
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using type = std::variant<MyType1, MyType2>;
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type value;
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REQUIRE_THROWS_AS(value.emplace<MyType2>(MyType2{}), int);
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REQUIRE(value.valueless_by_exception());
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CHECK("{valueless variant}" == ::Catch::Detail::stringify(value));
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}
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TEST_CASE( "variant<string, int>", "[toString][variant][approvals]")
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{
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using type = std::variant<std::string, int>;
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CHECK( "\"foo\"" == ::Catch::Detail::stringify(type{"foo"}) );
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CHECK( "0" == ::Catch::Detail::stringify(type{0}) );
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}
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TEST_CASE( "variant<variant<float, int>, string>", "[toString][variant][approvals]")
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{
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using inner = std::variant<MyType1, float, int>;
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using type = std::variant<inner, std::string>;
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CHECK( "0.5f" == ::Catch::Detail::stringify(type{0.5f}) );
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CHECK( "0" == ::Catch::Detail::stringify(type{0}) );
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CHECK( "\"foo\"" == ::Catch::Detail::stringify(type{"foo"}) );
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SECTION("valueless nested variant") {
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type value = inner{0.5f};
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REQUIRE( std::holds_alternative<inner>(value) );
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REQUIRE( std::holds_alternative<float>(std::get<inner>(value)) );
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REQUIRE_THROWS_AS( std::get<0>(value).emplace<MyType1>(MyType1{}), int );
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// outer variant is still valid and contains inner
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REQUIRE( std::holds_alternative<inner>(value) );
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// inner variant is valueless
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REQUIRE( std::get<inner>(value).valueless_by_exception() );
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CHECK( "{valueless variant}" == ::Catch::Detail::stringify(value) );
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}
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}
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TEST_CASE( "variant<nullptr,int,const char *>", "[toString][variant][approvals]" )
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{
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using type = std::variant<std::nullptr_t,int,const char *>;
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CHECK( "nullptr" == ::Catch::Detail::stringify(type{nullptr}) );
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CHECK( "42" == ::Catch::Detail::stringify(type{42}) );
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CHECK( "\"Catch me\"" == ::Catch::Detail::stringify(type{"Catch me"}) );
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}
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#endif // CATCH_INTERNAL_CONFIG_CPP17_VARIANT
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