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// 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
#ifndef CATCH_MATCHERS_PREDICATE_HPP_INCLUDED
#define CATCH_MATCHERS_PREDICATE_HPP_INCLUDED
#include <catch2/matchers/catch_matchers.hpp>
#include <catch2/internal/catch_meta.hpp>
#include <catch2/internal/catch_move_and_forward.hpp>
#include <string>
namespace Catch {
namespace Matchers {
namespace Detail {
std::string finalizeDescription(const std::string& desc);
} // namespace Detail
template <typename T, typename Predicate>
class PredicateMatcher final : public MatcherBase<T> {
Predicate m_predicate;
std::string m_description;
public:
PredicateMatcher(Predicate&& elem, std::string const& descr)
:m_predicate(CATCH_FORWARD(elem)),
m_description(Detail::finalizeDescription(descr))
{}
bool match( T const& item ) const override {
return m_predicate(item);
}
std::string describe() const override {
return m_description;
}
};
/**
* Creates a matcher that calls delegates `match` to the provided predicate.
*
* The user has to explicitly specify the argument type to the matcher
*/
template<typename T, typename Pred>
PredicateMatcher<T, Pred> Predicate(Pred&& predicate, std::string const& description = "") {
static_assert(is_callable<Pred(T)>::value, "Predicate not callable with argument T");
static_assert(std::is_same<bool, FunctionReturnType<Pred, T>>::value, "Predicate does not return bool");
return PredicateMatcher<T, Pred>(CATCH_FORWARD(predicate), description);
}
} // namespace Matchers
} // namespace Catch
#endif // CATCH_MATCHERS_PREDICATE_HPP_INCLUDED
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