Add test for the size_t class

[Flamefire]

Verify the constructor and increment/decrement operators

I wasn't sure

test/include/boost/test/data/size.hpp

Line 51 in 1018532

data::size_t operator--(int) { data::size_t res(*this); if( !is_inf() ) m_value--; return res; }

works as expected as the templated ctor might be preferred which would not copy the is_inf

The test also shows some inconsistencies in the over/underflow handling. It might be better to remove any operator taking a std::size_t which means those values will get converted to data::size_t and can be consistently handled.

[mborland]

LGTM

[mborland]

The test also shows some inconsistencies in the over/underflow handling. It might be better to remove any operator taking a std::size_t which means those values will get converted to data::size_t and can be consistently handled.

Yeah, that would likely be an improvement.