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Show bound when stringifying the WithinULP matcher

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Closes #1581
This commit is contained in:
Martin Hořeňovský 2019-06-14 20:16:12 +02:00
parent 1967feac49
commit 7142d5a8c9
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GPG key ID: DE48307B8B0D381A
7 changed files with 104 additions and 155 deletions
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35
include/internal/catch_matchers_floating.cpp
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@ -14,6 +14,9 @@
#include <cstdlib>
#include <cstdint>
#include <cstring>
#include <sstream>
#include <iomanip>
#include <limits>
namespace Catch {
namespace Matchers {
@ -74,8 +77,16 @@ bool almostEqualUlps(FP lhs, FP rhs, int maxUlpDiff) {
return ulpDiff <= maxUlpDiff;
}
template <typename FP>
FP step(FP start, FP direction, int steps) {
for (int i = 0; i < steps; ++i) {
start = std::nextafter(start, direction);
}
return start;
}
} // end anonymous namespace
namespace Catch {
namespace Matchers {
@ -125,7 +136,29 @@ namespace Floating {
#endif
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" : "");
std::stringstream ret;
ret << "is within " << m_ulps << " ULPs of " << ::Catch::Detail::stringify(m_target);
if (m_type == FloatingPointKind::Float) {
ret << 'f';
}
ret << " ([";
ret << std::fixed << std::setprecision(std::numeric_limits<double>::max_digits10);
if (m_type == FloatingPointKind::Double) {
ret << step(m_target, static_cast<double>(-INFINITY), m_ulps)
<< ", "
<< step(m_target, static_cast<double>(INFINITY), m_ulps);
} else {
ret << step<float>(static_cast<float>(m_target), -INFINITY, m_ulps)
<< ", "
<< step<float>(static_cast<float>(m_target), INFINITY, m_ulps);
}
ret << "])";
return ret.str();
//return "is within " + Catch::to_string(m_ulps) + " ULPs of " + ::Catch::Detail::stringify(m_target) + ((m_type == FloatingPointKind::Float)? "f" : "");
}
}// namespace Floating