Method describe

Bcore/src/main/cpp/Dobby/tests/catch.hpp:7768–7770

}

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} {