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Add GENERATE_COPY and GENERATE_VAR capturing generator macros

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Martin Hořeňovský 2019-03-31 14:11:10 +02:00
parent b77cec05c0
commit 3816e99d0c
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13 changed files with 450 additions and 55 deletions
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51
examples/310-Gen-VariablesInGenerators.cpp
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@ -8,41 +8,6 @@
#include <catch2/catch.hpp>
#include <random>
// Lets start by implementing a parametrizable double generator
class RandomDoubleGenerator : public Catch::Generators::IGenerator<double> {
std::minstd_rand m_rand;
std::uniform_real_distribution<> m_dist;
double current_number;
public:
RandomDoubleGenerator(double low, double high):
m_rand(std::random_device{}()),
m_dist(low, high)
{
static_cast<void>(next());
}
double const& get() const override;
bool next() override {
current_number = m_dist(m_rand);
return true;
}
};
// Avoids -Wweak-vtables
double const& RandomDoubleGenerator::get() const {
return current_number;
}
// Also provide a nice shortcut for creating the generator
Catch::Generators::GeneratorWrapper<double> random(double low, double high) {
return Catch::Generators::GeneratorWrapper<double>(std::unique_ptr<Catch::Generators::IGenerator<double>>(new RandomDoubleGenerator(low, high)));
}
TEST_CASE("Generate random doubles across different ranges",
"[generator][example][advanced]") {
// Workaround for old libstdc++
@ -55,16 +20,12 @@ TEST_CASE("Generate random doubles across different ranges",
}));
// This will not compile (intentionally), because it accesses a variable
// auto number = GENERATE(take(50, random(r.first, r.second)));
// We have to manually register the generators instead
// Notice that we are using value capture in the lambda, to avoid lifetime issues
auto number = Catch::Generators::generate( CATCH_INTERNAL_LINEINFO,
[=]{
using namespace Catch::Generators;
return makeGenerators(take(50, random(std::get<0>(r), std::get<1>(r))));
}
);
// 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);
}