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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_FLOATING_POINT_HPP_INCLUDED
#define CATCH_MATCHERS_FLOATING_POINT_HPP_INCLUDED
#include <catch2/matchers/catch_matchers.hpp>
namespace Catch {
namespace Matchers {
namespace Detail {
enum class FloatingPointKind : uint8_t;
}
class WithinAbsMatcher final : public MatcherBase<double> {
public:
WithinAbsMatcher(double target, double margin);
bool match(double const& matchee) const override;
std::string describe() const override;
private:
double m_target;
double m_margin;
};
//! Creates a matcher that accepts numbers within certain range of target
WithinAbsMatcher WithinAbs( double target, double margin );
class WithinUlpsMatcher final : public MatcherBase<double> {
public:
WithinUlpsMatcher( double target,
uint64_t ulps,
Detail::FloatingPointKind baseType );
bool match(double const& matchee) const override;
std::string describe() const override;
private:
double m_target;
uint64_t m_ulps;
Detail::FloatingPointKind m_type;
};
//! Creates a matcher that accepts doubles within certain ULP range of target
WithinUlpsMatcher WithinULP(double target, uint64_t maxUlpDiff);
//! Creates a matcher that accepts floats within certain ULP range of target
WithinUlpsMatcher WithinULP(float target, uint64_t maxUlpDiff);
// Given IEEE-754 format for floats and doubles, we can assume
// that float -> double promotion is lossless. Given this, we can
// assume that if we do the standard relative comparison of
// |lhs - rhs| <= epsilon * max(fabs(lhs), fabs(rhs)), then we get
// the same result if we do this for floats, as if we do this for
// doubles that were promoted from floats.
class WithinRelMatcher final : public MatcherBase<double> {
public:
WithinRelMatcher( double target, double epsilon );
bool match(double const& matchee) const override;
std::string describe() const override;
private:
double m_target;
double m_epsilon;
};
//! Creates a matcher that accepts doubles within certain relative range of target
WithinRelMatcher WithinRel(double target, double eps);
//! Creates a matcher that accepts doubles within 100*DBL_EPS relative range of target
WithinRelMatcher WithinRel(double target);
//! Creates a matcher that accepts doubles within certain relative range of target
WithinRelMatcher WithinRel(float target, float eps);
//! Creates a matcher that accepts floats within 100*FLT_EPS relative range of target
WithinRelMatcher WithinRel(float target);
class IsNaNMatcher final : public MatcherBase<double> {
public:
IsNaNMatcher() = default;
bool match( double const& matchee ) const override;
std::string describe() const override;
};
IsNaNMatcher IsNaN();
} // namespace Matchers
} // namespace Catch
#endif // CATCH_MATCHERS_FLOATING_POINT_HPP_INCLUDED
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