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36 lines
1.3 KiB
C++
36 lines
1.3 KiB
C++
// 310-Gen-VariablesInGenerator.cpp
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// Shows how to use variables when creating generators.
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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 -- thus they should be either captured
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// by value directly, or copied by the generators during construction.
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#include <catch2/catch_test_macros.hpp>
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#include <catch2/catch_generators_generic.hpp>
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#include <catch2/catch_generators_specific.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 r = 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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// This will not compile (intentionally), because it accesses a variable
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// auto number = GENERATE(take(50, random(std::get<0>(r), std::get<1>(r))));
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// GENERATE_COPY copies all variables mentioned inside the expression
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// thus this will work.
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auto number = GENERATE_COPY(take(50, random(std::get<0>(r), std::get<1>(r))));
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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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