@SanPen You can add a compiler flag TURN_OFF_PLATFORM_STRING as suggested by code comment.

U is a really bad name, a user of our library was also using cpprestsdk and we used U as the name of a template parameter, think template< typename T, typename U >. Later we used U as a return type for a function pointer, something like using func_t = U(*)(int,int); - and that didn't work because of the macro U. Please stop defining macros with extremely common names.

Exactly, I also changed it to USTR, but whenever I update the code or someone else downloads cpprestskd to use it with my code, they have to rename the macro as well.

So, it would be very helpfull to rename this macro (and potentially others) to something harder to be used by others.

We completely agree that U(X) is an inappropriate macro; however changing it would be enormously breaking for existing code -- something we certainly won't do between major versions.

The correct mechanism to address this problem is what @aksswami has suggested: define TURN_OFF_PLATFORM_STRING and use _XPLATSTR in your own code.