Hi, I am trying to compare two floating point numbers but am encountering somewhat strange behaviour.
The minimal compilable example:
#define BOOST_TEST_MODULE tests
#define BOOST_TEST_DYN_LINK
#include <boost/test/unit_test.hpp>
BOOST_AUTO_TEST_SUITE(testsuite)
BOOST_AUTO_TEST_CASE(test1)
{
namespace tt = boost::test_tools;
BOOST_TEST(0.1 == 0.2, tt::tolerance(0.01)); // will fail
BOOST_TEST(0.1f == 0.2f, tt::tolerance(0.02)); // will fail too, but
different error message...
}
BOOST_AUTO_TEST_SUITE_END()
When compiling with:
clang++ (clang version 7.0.1-8 (tags/RELEASE_701/final))
flags: -o main -g -std=c++17 -stdlib=libc++ -lboost_unit_test_framework main.cpp
boost: 1.72.0
I'll get the following output:
Running 1 test case...
main.cpp(10): error: in "testsuite/test1": check 0.1 == 0.2 has failed
[0.10000000000000001 != 0.20000000000000001]. Relative difference exceeds
tolerance [1 > 0.01]
main.cpp(11): error: in "testsuite/test1": check 0.1f == 0.2f has failed
[0.100000001 != 0.200000003]
*** 2 failures are detected in the test module "tests"
Why am I getting two different messages? I expected those to be the same...
Regards, Matthijs
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