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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_CONTAINS_HPP_INCLUDED
#define CATCH_MATCHERS_CONTAINS_HPP_INCLUDED
#include <catch2/matchers/catch_matchers_templated.hpp>
#include <catch2/internal/catch_move_and_forward.hpp>
#include <algorithm>
#include <functional>
namespace Catch {
namespace Matchers {
//! Matcher for checking that an element in range is equal to specific element
template <typename T, typename Equality>
class ContainsElementMatcher final : public MatcherGenericBase {
T m_desired;
Equality m_eq;
public:
template <typename T2, typename Equality2>
ContainsElementMatcher(T2&& target, Equality2&& predicate):
m_desired(CATCH_FORWARD(target)),
m_eq(CATCH_FORWARD(predicate))
{}
std::string describe() const override {
return "contains element " + Catch::Detail::stringify(m_desired);
}
template <typename RangeLike>
bool match( RangeLike&& rng ) const {
for ( auto&& elem : rng ) {
if ( m_eq( elem, m_desired ) ) { return true; }
}
return false;
}
};
//! Meta-matcher for checking that an element in a range matches a specific matcher
template <typename Matcher>
class ContainsMatcherMatcher final : public MatcherGenericBase {
Matcher m_matcher;
public:
// Note that we do a copy+move to avoid having to SFINAE this
// constructor (and also avoid some perfect forwarding failure
// cases)
ContainsMatcherMatcher(Matcher matcher):
m_matcher(CATCH_MOVE(matcher))
{}
template <typename RangeLike>
bool match(RangeLike&& rng) const {
for (auto&& elem : rng) {
if (m_matcher.match(elem)) {
return true;
}
}
return false;
}
std::string describe() const override {
return "contains element matching " + m_matcher.describe();
}
};
/**
* Creates a matcher that checks whether a range contains a specific element.
*
* Uses `std::equal_to` to do the comparison
*/
template <typename T>
std::enable_if_t<!Detail::is_matcher<T>::value,
ContainsElementMatcher<T, std::equal_to<>>> Contains(T&& elem) {
return { CATCH_FORWARD(elem), std::equal_to<>{} };
}
//! Creates a matcher that checks whether a range contains element matching a matcher
template <typename Matcher>
std::enable_if_t<Detail::is_matcher<Matcher>::value,
ContainsMatcherMatcher<Matcher>> Contains(Matcher&& matcher) {
return { CATCH_FORWARD(matcher) };
}
/**
* Creates a matcher that checks whether a range contains a specific element.
*
* Uses `eq` to do the comparisons, the element is provided on the rhs
*/
template <typename T, typename Equality>
ContainsElementMatcher<T, Equality> Contains(T&& elem, Equality&& eq) {
return { CATCH_FORWARD(elem), CATCH_FORWARD(eq) };
}
}
}
#endif // CATCH_MATCHERS_CONTAINS_HPP_INCLUDED
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