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+
+// Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE.txt or copy at
+// https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
+// 310-Gen-VariablesInGenerator.cpp
+// Shows how to use variables when creating generators.
+
+// 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 -- thus they should be either captured
+// by value directly, or copied by the generators during construction.
+
+#include <catch2/catch_test_macros.hpp>
+#include <catch2/generators/catch_generators_adapters.hpp>
+#include <catch2/generators/catch_generators_random.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 r = GENERATE(table<double, double>({
+ record{3, 4},
+ record{-4, -3},
+ record{10, 1000}
+ }));
+
+ // This will not compile (intentionally), because it accesses a variable
+ // auto number = GENERATE(take(50, random(std::get<0>(r), std::get<1>(r))));
+
+ // GENERATE_COPY copies all variables mentioned inside the expression
+ // thus this will work.
+ auto number = GENERATE_COPY(take(50, random(std::get<0>(r), std::get<1>(r))));
+
+ REQUIRE(std::abs(number) > 0);
+}
+
+// Compiling and running this file will result in 150 successful assertions
+