43 lines
1.6 KiB
C++
43 lines
1.6 KiB
C++
// 311-Gen-CustomCapture.cpp
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// Shows how to provide custom capture list to the generator expression
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// Note that using variables inside generators is dangerous and should
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// be done only if you know what you are doing, because the generators
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// _WILL_ outlive the variables. Also, even if you know what you are
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// doing, you should probably use GENERATE_COPY or GENERATE_REF macros
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// instead. However, if your use case requires having a
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// per-variable custom capture list, this example shows how to achieve
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// that.
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#include <catch2/catch_test_macros.hpp>
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#include <catch2/generators/catch_generators_adapters.hpp>
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#include <catch2/generators/catch_generators_random.hpp>
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TEST_CASE("Generate random doubles across different ranges",
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"[generator][example][advanced]") {
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// Workaround for old libstdc++
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using record = std::tuple<double, double>;
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// Set up 3 ranges to generate numbers from
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auto r1 = GENERATE(table<double, double>({
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record{3, 4},
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record{-4, -3},
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record{10, 1000}
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}));
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auto r2(r1);
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// This will take r1 by reference and r2 by value.
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// Note that there are no advantages for doing so in this example,
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// it is done only for expository purposes.
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auto number = Catch::Generators::generate( "custom capture generator", CATCH_INTERNAL_LINEINFO,
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[&r1, r2]{
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using namespace Catch::Generators;
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return makeGenerators(take(50, random(std::get<0>(r1), std::get<1>(r2))));
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}
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);
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REQUIRE(std::abs(number) > 0);
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}
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// Compiling and running this file will result in 150 successful assertions
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