Using BOOST_REQUIRE () should not cause "comparison of integers of different" warning

Hi! When I use BOOST_TEST_REQUIRE(==) the compiler generates "comparison of integers of different" warnings, but without BOOST_*() macros everything is compiled silently even with -Wall -Wextra.

```C++

#include

#include

bool foo(std::vector& v) {
BOOST_TEST_REQUIRE(v.size() == 0); // warning: comparison of integers of different signs: 'const unsigned long' and 'const int'
return v.size() == 0; // Okay
}
```