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145 lines
3.9 KiB
C++
145 lines
3.9 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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#include "catch_matchers_floating.h"
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#include <cmath>
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#include <cstdint>
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#include <cstring>
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#include <stdexcept>
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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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Float,
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Double
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};
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}
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}
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}
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namespace {
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union Float_t {
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Float_t(float num = 0.0f) : f(num) {}
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// Portable extraction of components.
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bool Negative() const { return i < 0; }
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int32_t RawMantissa() const { return i & ((1 << 23) - 1); }
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int32_t RawExponent() const { return (i >> 23) & 0xFF; }
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int32_t i;
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float f;
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};
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template <typename T>
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struct Converter;
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template <>
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struct Converter<float> {
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static_assert(sizeof(float) == sizeof(int32_t), "Important ULP matcher assumption violated");
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Converter(float f) {
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std::memcpy(&i, &f, sizeof(f));
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}
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int32_t i;
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};
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template <>
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struct Converter<double> {
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static_assert(sizeof(double) == sizeof(int64_t), "Important ULP matcher assumption violated");
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Converter(double d) {
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std::memcpy(&i, &d, sizeof(d));
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}
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int64_t i;
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};
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template <typename T>
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auto convert(T t) -> Converter<T> {
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return Converter<T>(t);
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}
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template <typename FP>
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bool almostEqualUlps(FP lhs, FP rhs, int maxUlpDiff) {
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// Comparison with NaN should always be false.
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// This way we can rule it out before getting into the ugly details
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if (std::isnan(lhs) || std::isnan(rhs)) {
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return false;
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}
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auto lc = convert(lhs);
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auto rc = convert(rhs);
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if ((lc.i < 0) != (rc.i < 0)) {
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// Potentially we can have +0 and -0
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return lhs == rhs;
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}
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auto ulpDiff = abs(lc.i - rc.i);
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return ulpDiff <= maxUlpDiff;
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}
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}
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namespace Catch {
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namespace Matchers {
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namespace Floating {
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WithinAbsMatcher::WithinAbsMatcher(double target, double margin)
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:m_target{ target }, m_margin{ margin } {}
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// Performs equivalent check of std::fabs(lhs - rhs) <= margin
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// But without the subtraction to allow for INFINITY in comparison
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bool WithinAbsMatcher::match(double const& matchee) const {
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return (matchee + m_margin >= m_target) && (m_target + m_margin >= m_margin);
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}
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std::string WithinAbsMatcher::describe() const {
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return "is within " + std::to_string(m_margin) + " of " + std::to_string(m_target);
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}
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WithinUlpsMatcher::WithinUlpsMatcher(double target, int ulps, FloatingPointKind baseType)
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:m_target{ target }, m_ulps{ ulps }, m_type{ baseType } {
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if (m_ulps < 0) {
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throw std::domain_error("Expected ulp difference has to be >0");
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}
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}
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bool WithinUlpsMatcher::match(double const& matchee) const {
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switch (m_type) {
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case FloatingPointKind::Float:
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return almostEqualUlps<float>(static_cast<float>(matchee), static_cast<float>(m_target), m_ulps);
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case FloatingPointKind::Double:
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return almostEqualUlps<double>(matchee, m_target, m_ulps);
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default:
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throw std::domain_error("Unknown FloatingPointKind value");
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}
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}
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std::string WithinUlpsMatcher::describe() const {
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return "is within " + std::to_string(m_ulps) + " ULPs of " + std::to_string(m_target) + ((m_type == FloatingPointKind::Float)? "f" : "");
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}
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}// namespace Floating
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Floating::WithinUlpsMatcher WithinULP(double target, int maxUlpDiff) {
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return Floating::WithinUlpsMatcher(target, maxUlpDiff, Floating::FloatingPointKind::Double);
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}
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Floating::WithinUlpsMatcher WithinULP(float target, int maxUlpDiff) {
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return Floating::WithinUlpsMatcher(target, maxUlpDiff, Floating::FloatingPointKind::Float);
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}
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Floating::WithinAbsMatcher WithinAbs(double target, double margin) {
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return Floating::WithinAbsMatcher(target, margin);
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}
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} // namespace Matchers
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} // namespace Catch
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