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Add another example for generators
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@ -15,6 +15,7 @@
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- Listener: [Listeners](../examples/210-Evt-EventListeners.cpp)
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- Configuration: [Provide your own output streams](../examples/231-Cfg-OutputStreams.cpp)
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- Generators: [Create your own generator](../examples/300-Gen-OwnGenerator.cpp)
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- Generators: [Use map to convert types in GENERATE expression](../examples/301-Gen-MapTypeConversion.cpp)
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- Generators: [Use variables in generator expressions](../examples/310-Gen-VariablesInGenerators.cpp)
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54
examples/301-Gen-MapTypeConversion.cpp
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54
examples/301-Gen-MapTypeConversion.cpp
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@ -0,0 +1,54 @@
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// 301-Gen-MapTypeConversion.cpp
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// Shows how to use map to modify generator's return type.
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// TODO
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#include <catch2/catch.hpp>
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#include <string>
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#include <sstream>
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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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throw Catch::GeneratorException("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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return m_line;
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}
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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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// 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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std::unique_ptr<Catch::Generators::IGenerator<std::string>>(
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new LineGenerator()
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)
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);
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}
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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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@ -45,6 +45,7 @@ set( SOURCES_IDIOMATIC_TESTS
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120-Bdd-ScenarioGivenWhenThen.cpp
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210-Evt-EventListeners.cpp
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300-Gen-OwnGenerator.cpp
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301-Gen-MapTypeConversion.cpp
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310-Gen-VariablesInGenerators.cpp
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)
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