Function FloatingPointLE

tests/external/gmock-1.7.0/gtest/src/gtest.cc:1061–1092

// Helper template for implementing FloatLE() and DoubleLE().
template <typename RawType>
AssertionResult FloatingPointLE(const char* expr1,
                                const char* expr2,
                                RawType val1,
                                RawType val2) {
  // Returns success if val1 is less than val2,
  if (val1 < val2) {
    return AssertionSuccess();
  }

  // or if val1 is almost equal to val2.
  const FloatingPoint<RawType> lhs(val1), rhs(val2);
  if (lhs.AlmostEquals(rhs)) {
    return AssertionSuccess();
  }

  // Note that the above two checks will both fail if either val1 or
  // val2 is NaN, as the IEEE floating-point standard requires that
  // any predicate involving a NaN must return false.

  ::std::stringstream val1_ss;
  val1_ss << std::setprecision(std::numeric_limits<RawType>::digits10 + 2)
          << val1;

  ::std::stringstream val2_ss;
  val2_ss << std::setprecision(std::numeric_limits<RawType>::digits10 + 2)
          << val2;

  return AssertionFailure()
      << "Expected: (" << expr1 << ") <= (" << expr2 << ")\n"
      << "  Actual: " << StringStreamToString(&val1_ss) << " vs "
      << StringStreamToString(&val2_ss);
}

}  // namespace internal