// 311-Gen-CustomCapture.cpp // Shows how to provide custom capture list to the generator expression // Note that using variables inside generators is dangerous and should // be done only if you know what you are doing, because the generators // _WILL_ outlive the variables. Also, even if you know what you are // doing, you should probably use GENERATE_COPY or GENERATE_REF macros // instead. However, if your use case requires having a // per-variable custom capture list, this example shows how to achieve // that. #include #include #include TEST_CASE("Generate random doubles across different ranges", "[generator][example][advanced]") { // Workaround for old libstdc++ using record = std::tuple; // Set up 3 ranges to generate numbers from auto r1 = GENERATE(table({ record{3, 4}, record{-4, -3}, record{10, 1000} })); auto r2(r1); // This will take r1 by reference and r2 by value. // Note that there are no advantages for doing so in this example, // it is done only for expository purposes. auto number = Catch::Generators::generate( "custom capture generator", CATCH_INTERNAL_LINEINFO, [&r1, r2]{ using namespace Catch::Generators; return makeGenerators(take(50, random(std::get<0>(r1), std::get<1>(r2)))); } ); REQUIRE(std::abs(number) > 0); } // Compiling and running this file will result in 150 successful assertions