包含的预处理程序定义defined(X)永远不会评估为true,但(defined X)会.这发生在MSVC9中; 我还没有测试过其他预处理器.一个简单的例子:
#define FEATURE0 1
#define FEATURE1 0
#define FEATURE2 1
#define FEATURE3 (FEATURE0 && !FEATURE1 && (defined(FEATURE2)))
#define FEATURE4 (FEATURE0 && !FEATURE1 && (defined FEATURE2))
#define FEATURE5 (FEATURE0 && !FEATURE1 && (defined (FEATURE2)))
#if FEATURE3
#pragma message("FEATURE3 Enabled")
#elif (FEATURE0 && !FEATURE1 && (defined(FEATURE2)))
#pragma message("FEATURE3 Enabled (Fallback)")
#endif
#if FEATURE4
#pragma message("FEATURE4 Enabled")
#elif (FEATURE0 && !FEATURE1 && (defined FEATURE2))
#pragma message("FEATURE4 Enabled (Fallback)")
#endif
#if FEATURE5
#pragma message("FEATURE5 Enabled")
#elif (FEATURE0 && …