| // 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 <catch2/catch.hpp> |
| |
| TEST_CASE("Generate random doubles across different ranges", |
| "[generator][example][advanced]") { |
| // Workaround for old libstdc++ |
| using record = std::tuple<double, double>; |
| // Set up 3 ranges to generate numbers from |
| auto r1 = GENERATE(table<double, double>({ |
| 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( 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 |
| |