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Home » Tip Bank » C++
Language: C++
Expertise: Intermediate
Dec 21, 2001

Declaring Conditional typedefs


Conditional typedef declarations can be useful in cross-platform development. For example, some platforms define long as a 32-bit integer. Other platforms treat long as a 64-bit integer. You can create a portable typedef name that represents a 64-bit integer like this:
 
#if defined(ALPHA_PROCESSOR)
 typedef long INT64;
#else
 typedef __int64 INT64; // windows
#endif

Regardless of the target platform, the typedef INT64 now represents a 64-bit integer.
Danny Kalev
 
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