simpleassert.cpp

24学时攻克C++光盘源代码 深入浅出 方便实用

 // Listing 21.3 ASSERTS
 #define DEBUG
 #include <iostream>

 #ifndef DEBUG
     #define ASSERT(x)
 #else
     #define ASSERT(x) \
         if (! (x)) \
         { \
             std::cout << "ERROR!! Assert " << #x << " failed\n"; \
             std::cout << " on line " << __LINE__  << "\n"; \
             std::cout << " in file " << __FILE__ << "\n";  \
         }
 #endif

 int main()
 {
     int x = 5;
     std::cout << "First assert: \n";
     ASSERT(x==5);
     std::cout << "\nSecond assert: \n";
     ASSERT(x != 5);
     std::cout << "\nDone.\n";
     return 0;
 }