mirror of
https://github.com/catchorg/Catch2.git
synced 2025-10-31 12:17:11 +01:00
cde3509664
* bugprone-branch-clone * bugprone-copy-constructor-init * bugprone-empty-catch * bugprone-sizeof-expression * bugprone-switch-missing-default-case * bugprone-unused-local-non-trivial-variable * clang-analyzer-core.uninitialized.Assign * clang-analyzer-cplusplus.Move * clang-analyzer-optin.cplusplus.VirtualCall * modernize-loop-convert * modernize-raw-string-literal * modernize-use-equals-default * modernize-use-override * modernize-use-using * performance-avoid-endl * performance-inefficient-string-concatenation * performance-inefficient-vector-operation * performance-noexcept-move-constructor * performance-unnecessary-value-param (and improve generator example) * readability-duplicate-include * readability-inconsistent-declaration-parameter-name * readability-non-const-parameter * readability-redundant-casting * readability-redundant-member-init * readability-redundant-smartptr-get * readability-static-accessed-through-instance * unused variable in amalgamted tests
70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
|
|
// 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
|
|
|
|
// 301-Gen-MapTypeConversion.cpp
|
|
// Shows how to use map to modify generator's return type.
|
|
|
|
// Specifically we wrap a std::string returning generator with a generator
|
|
// that converts the strings using stoi, so the returned type is actually
|
|
// an int.
|
|
|
|
#include <catch2/catch_test_macros.hpp>
|
|
#include <catch2/generators/catch_generators_adapters.hpp>
|
|
|
|
#include <string>
|
|
#include <sstream>
|
|
|
|
namespace {
|
|
|
|
// Returns a line from a stream. You could have it e.g. read lines from
|
|
// a file, but to avoid problems with paths in examples, we will use
|
|
// a fixed stringstream.
|
|
class LineGenerator final : public Catch::Generators::IGenerator<std::string> {
|
|
std::string m_line;
|
|
std::stringstream m_stream;
|
|
public:
|
|
explicit LineGenerator( std::string const& lines ) {
|
|
m_stream.str( lines );
|
|
if (!next()) {
|
|
Catch::Generators::Detail::throw_generator_exception("Couldn't read a single line");
|
|
}
|
|
}
|
|
|
|
std::string const& get() const override;
|
|
|
|
bool next() override {
|
|
return !!std::getline(m_stream, m_line);
|
|
}
|
|
};
|
|
|
|
std::string const& LineGenerator::get() const {
|
|
return m_line;
|
|
}
|
|
|
|
// This helper function provides a nicer UX when instantiating the generator
|
|
// Notice that it returns an instance of GeneratorWrapper<std::string>, which
|
|
// is a value-wrapper around std::unique_ptr<IGenerator<std::string>>.
|
|
Catch::Generators::GeneratorWrapper<std::string>
|
|
lines( std::string const& lines ) {
|
|
return Catch::Generators::GeneratorWrapper<std::string>(
|
|
new LineGenerator( lines ) );
|
|
}
|
|
|
|
} // end anonymous namespace
|
|
|
|
|
|
TEST_CASE("filter can convert types inside the generator expression", "[example][generator]") {
|
|
auto num = GENERATE(
|
|
map<int>( []( std::string const& line ) { return std::stoi( line ); },
|
|
lines( "1\n2\n3\n4\n" ) ) );
|
|
|
|
REQUIRE(num > 0);
|
|
}
|
|
|
|
// Compiling and running this file will result in 4 successful assertions
|