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determine CPU architecture in D

I have a C header file (it's a part of some SDK) and there is a typedef which depends on system architecture (whether it is 32 or 64-bit), how do I transfer it to my D module? Thanks.

Edit: OK, that was too simple and I've already find a solution... If someone interested, it is:

version(X86) {
  typedef int your_type;
}
version(X86_64) {
  typedef long your_type;
}
Solution 
  • version(X86)
{
    // 32-bit
}
else
version(X86_64)
{
    // 64-bit
}
else
{
    // none of the above
}

    Source: http://digitalmars.com/d/2.0/version.html