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+// 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
+