How to detect if the Windows DWORD_PTR type is supported, using an ifdef?
c, c++, visual-c++, win64, windows
Solution
The macro `MSC_VER` is a value that is within the range `[1200, 1300)` for MSVC 6. So you can use `#if MSC_VER>=1200 && MSC_VER<1300`.
EDIT: As Anders said, this is not really that valid of a test beyond "is my compiler MSVC 6". However, you can also use:
#if defined(MAXULONG_PTR)
Since `DWORD_PTR` is a value type, it has a maximum value defined for it in `basetsd.h`.
Problem
There are some new integer types in the Windows API to support Win64. They haven't always been supported; e.g. they aren't present in MSVC6. How can I write an `#if` condition to detect if these types are supported by `<windows.h>`? (My code needs to compile under many different versions of Microsoft Visual C++, including MSVC6. So I need to provide my own definitions of these types, with an `#if` to disable them in newer compilers). (For searchers, the full list of types is: DWORD_PTR, INT_PTR, LONG_PTR, UINT_PTR, ULONG_PTR)