mirror of
https://github.com/catchorg/Catch2.git
synced 2024-11-04 05:09:53 +01:00
0074926e5c
Android apparently does not support `std::to_string`, so we add a small polyfill over it. Right now only the ULP matcher uses it, but we have had plans to use it in `StringMaker<int>` and friends, as it performs a lot better than `std::stringstream` based stringification on MSVC. See #1280 for more details
141 lines
3.8 KiB
C++
141 lines
3.8 KiB
C++
/*
|
|
* Created by Martin on 07/11/2017.
|
|
*
|
|
* Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
* file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
*/
|
|
|
|
#include "catch_matchers_floating.h"
|
|
#include "catch_to_string.hpp"
|
|
#include "catch_tostring.h"
|
|
|
|
#include <cstdlib>
|
|
#include <cstdint>
|
|
#include <cstring>
|
|
#include <stdexcept>
|
|
|
|
namespace Catch {
|
|
namespace Matchers {
|
|
namespace Floating {
|
|
enum class FloatingPointKind : uint8_t {
|
|
Float,
|
|
Double
|
|
};
|
|
}
|
|
}
|
|
}
|
|
|
|
namespace {
|
|
|
|
template <typename T>
|
|
struct Converter;
|
|
|
|
template <>
|
|
struct Converter<float> {
|
|
static_assert(sizeof(float) == sizeof(int32_t), "Important ULP matcher assumption violated");
|
|
Converter(float f) {
|
|
std::memcpy(&i, &f, sizeof(f));
|
|
}
|
|
int32_t i;
|
|
};
|
|
|
|
template <>
|
|
struct Converter<double> {
|
|
static_assert(sizeof(double) == sizeof(int64_t), "Important ULP matcher assumption violated");
|
|
Converter(double d) {
|
|
std::memcpy(&i, &d, sizeof(d));
|
|
}
|
|
int64_t i;
|
|
};
|
|
|
|
template <typename T>
|
|
auto convert(T t) -> Converter<T> {
|
|
return Converter<T>(t);
|
|
}
|
|
|
|
template <typename FP>
|
|
bool almostEqualUlps(FP lhs, FP rhs, int maxUlpDiff) {
|
|
// Comparison with NaN should always be false.
|
|
// This way we can rule it out before getting into the ugly details
|
|
if (std::isnan(lhs) || std::isnan(rhs)) {
|
|
return false;
|
|
}
|
|
|
|
auto lc = convert(lhs);
|
|
auto rc = convert(rhs);
|
|
|
|
if ((lc.i < 0) != (rc.i < 0)) {
|
|
// Potentially we can have +0 and -0
|
|
return lhs == rhs;
|
|
}
|
|
|
|
auto ulpDiff = std::abs(lc.i - rc.i);
|
|
return ulpDiff <= maxUlpDiff;
|
|
}
|
|
|
|
}
|
|
|
|
|
|
namespace Catch {
|
|
namespace Matchers {
|
|
namespace Floating {
|
|
WithinAbsMatcher::WithinAbsMatcher(double target, double margin)
|
|
:m_target{ target }, m_margin{ margin } {
|
|
if (m_margin < 0) {
|
|
throw std::domain_error("Allowed margin difference has to be >= 0");
|
|
}
|
|
}
|
|
|
|
// Performs equivalent check of std::fabs(lhs - rhs) <= margin
|
|
// But without the subtraction to allow for INFINITY in comparison
|
|
bool WithinAbsMatcher::match(double const& matchee) const {
|
|
return (matchee + m_margin >= m_target) && (m_target + m_margin >= matchee);
|
|
}
|
|
|
|
std::string WithinAbsMatcher::describe() const {
|
|
return "is within " + ::Catch::Detail::stringify(m_margin) + " of " + ::Catch::Detail::stringify(m_target);
|
|
}
|
|
|
|
|
|
WithinUlpsMatcher::WithinUlpsMatcher(double target, int ulps, FloatingPointKind baseType)
|
|
:m_target{ target }, m_ulps{ ulps }, m_type{ baseType } {
|
|
if (m_ulps < 0) {
|
|
throw std::domain_error("Allowed ulp difference has to be >= 0");
|
|
}
|
|
}
|
|
|
|
bool WithinUlpsMatcher::match(double const& matchee) const {
|
|
switch (m_type) {
|
|
case FloatingPointKind::Float:
|
|
return almostEqualUlps<float>(static_cast<float>(matchee), static_cast<float>(m_target), m_ulps);
|
|
case FloatingPointKind::Double:
|
|
return almostEqualUlps<double>(matchee, m_target, m_ulps);
|
|
default:
|
|
throw std::domain_error("Unknown FloatingPointKind value");
|
|
}
|
|
}
|
|
|
|
std::string WithinUlpsMatcher::describe() const {
|
|
return "is within " + Catch::to_string(m_ulps) + " ULPs of " + ::Catch::Detail::stringify(m_target) + ((m_type == FloatingPointKind::Float)? "f" : "");
|
|
}
|
|
|
|
}// namespace Floating
|
|
|
|
|
|
|
|
Floating::WithinUlpsMatcher WithinULP(double target, int maxUlpDiff) {
|
|
return Floating::WithinUlpsMatcher(target, maxUlpDiff, Floating::FloatingPointKind::Double);
|
|
}
|
|
|
|
Floating::WithinUlpsMatcher WithinULP(float target, int maxUlpDiff) {
|
|
return Floating::WithinUlpsMatcher(target, maxUlpDiff, Floating::FloatingPointKind::Float);
|
|
}
|
|
|
|
Floating::WithinAbsMatcher WithinAbs(double target, double margin) {
|
|
return Floating::WithinAbsMatcher(target, margin);
|
|
}
|
|
|
|
} // namespace Matchers
|
|
} // namespace Catch
|
|
|