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1d1ccf8f3c
Doing some benchmarking with ClangBuildAnalyzer suggests that compiling Catch2's `SelfTest` spends 10% of the time instantiating `std::unique_ptr` for some interface types required for registering and running tests. The lesser compilation overhead of `Catch::Detail::unique_ptr` should significantly reduce that time. The compiled implementation was also changed to use the custom impl, to avoid having to convert between using `std::unique_ptr` and `Catch::Detail::unique_ptr`. This will likely also improve the compile times of the implementation, but that is less important than improving compilation times of the user's TUs with tests.
58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
// 301-Gen-MapTypeConversion.cpp
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// Shows how to use map to modify generator's return type.
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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 <string>
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#include <sstream>
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namespace {
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// Returns a line from a stream. You could have it e.g. read lines from
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// a file, but to avoid problems with paths in examples, we will use
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// a fixed stringstream.
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class LineGenerator : public Catch::Generators::IGenerator<std::string> {
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std::string m_line;
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std::stringstream m_stream;
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public:
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LineGenerator() {
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m_stream.str("1\n2\n3\n4\n");
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if (!next()) {
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Catch::Generators::Detail::throw_generator_exception("Couldn't read a single line");
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}
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}
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std::string const& get() const override;
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bool next() override {
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return !!std::getline(m_stream, m_line);
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}
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};
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std::string const& LineGenerator::get() const {
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return m_line;
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}
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// This helper function provides a nicer UX when instantiating the generator
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// Notice that it returns an instance of GeneratorWrapper<std::string>, which
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// is a value-wrapper around std::unique_ptr<IGenerator<std::string>>.
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Catch::Generators::GeneratorWrapper<std::string> lines(std::string /* ignored for example */) {
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return Catch::Generators::GeneratorWrapper<std::string>(
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new LineGenerator()
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);
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}
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} // end anonymous namespace
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TEST_CASE("filter can convert types inside the generator expression", "[example][generator]") {
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auto num = GENERATE(map<int>([](std::string const& line) { return std::stoi(line); },
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lines("fake-file")));
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REQUIRE(num > 0);
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}
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// Compiling and running this file will result in 4 successful assertions
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