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Diffstat (limited to 'examples/311-Gen-CustomCapture.cpp')
-rw-r--r-- | examples/311-Gen-CustomCapture.cpp | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/examples/311-Gen-CustomCapture.cpp b/examples/311-Gen-CustomCapture.cpp new file mode 100644 index 00000000..da6d686f --- /dev/null +++ b/examples/311-Gen-CustomCapture.cpp @@ -0,0 +1,41 @@ +// 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 + |