ASSERTS : define « Development « C++ Tutorial

1. C++ Tutorial
2. Development
3. define

#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;
 }

First assert:

Second assert:
ERROR!! Assert x != 5 failed
 on line 24
 in file ASSERTS.cpp

Done.