71 lines
2.7 KiB
C++
71 lines
2.7 KiB
C++
/*
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* Created by Martin on 07/11/2017.
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*
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* Distributed under the Boost Software License, Version 1.0. (See accompanying
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* file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*/
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#ifndef TWOBLUECUBES_CATCH_MATCHERS_FLOATING_H_INCLUDED
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#define TWOBLUECUBES_CATCH_MATCHERS_FLOATING_H_INCLUDED
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#include "catch_matchers.h"
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namespace Catch {
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namespace Matchers {
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namespace Floating {
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enum class FloatingPointKind : uint8_t;
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struct WithinAbsMatcher : MatcherBase<double> {
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WithinAbsMatcher(double target, double margin);
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bool match(double const& matchee) const override;
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std::string describe() const override;
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private:
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double m_target;
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double m_margin;
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};
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struct WithinUlpsMatcher : MatcherBase<double> {
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WithinUlpsMatcher(double target, uint64_t ulps, FloatingPointKind baseType);
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bool match(double const& matchee) const override;
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std::string describe() const override;
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private:
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double m_target;
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uint64_t m_ulps;
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FloatingPointKind m_type;
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};
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// Given IEEE-754 format for floats and doubles, we can assume
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// that float -> double promotion is lossless. Given this, we can
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// assume that if we do the standard relative comparison of
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// |lhs - rhs| <= epsilon * max(fabs(lhs), fabs(rhs)), then we get
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// the same result if we do this for floats, as if we do this for
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// doubles that were promoted from floats.
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struct WithinRelMatcher : MatcherBase<double> {
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WithinRelMatcher(double target, double epsilon);
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bool match(double const& matchee) const override;
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std::string describe() const override;
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private:
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double m_target;
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double m_epsilon;
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};
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} // namespace Floating
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// The following functions create the actual matcher objects.
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// This allows the types to be inferred
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Floating::WithinUlpsMatcher WithinULP(double target, uint64_t maxUlpDiff);
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Floating::WithinUlpsMatcher WithinULP(float target, uint64_t maxUlpDiff);
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Floating::WithinAbsMatcher WithinAbs(double target, double margin);
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Floating::WithinRelMatcher WithinRel(double target, double eps);
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// defaults epsilon to 100*numeric_limits<double>::epsilon()
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Floating::WithinRelMatcher WithinRel(double target);
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Floating::WithinRelMatcher WithinRel(float target, float eps);
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// defaults epsilon to 100*numeric_limits<float>::epsilon()
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Floating::WithinRelMatcher WithinRel(float target);
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} // namespace Matchers
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} // namespace Catch
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#endif // TWOBLUECUBES_CATCH_MATCHERS_FLOATING_H_INCLUDED
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