宏定义问题
//Testing the allege() macro

#include <iostream>
#include "ALLEGE.h"
#include <fstream>
#define NDEBUG //turn off asserts
using namespace std;

int main()
{
int i = 1;
allege(i,"value must be nonzero");
void* m = malloc(100);
allegemem(m);
ifstream nofile("nofile.xxx");
allegefile(nofile);
return 0;
}


#ifndef ALLEGE_H_INCLUDED
#define ALLEGE_H_INCLUDED

//ALLEGE.H --error checking
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

inline void allege_error(int val,const char *msg)
{
if(!val)
{
fprintf(stderr,"error: %s\n",msg);
#ifdef NDEBUG //turn off debug
exit(1);
#endif
}
}

#define allege(expr,msg) \
{ allege_error((expr)?1:0,msg); \
assert(expr); }
#define allegemem(expr) \
allege(expr,"out of memory")

#define allegefile(expr) \
allege(expr,"could not open file")

#endif // ALLEGE_H_INCLUDED


为什么在主程序中加了#define NDEBUG，但还是会提示assert检查错误？

[解决办法]
宏定义和使用的先后位置顺序要清楚

lz 的使用明明在 define 之前，当然不起作用

C/C++ code

#define NDEBUG //turn off asserts#include "ALLEGE.h"#include <fstream>
[解决办法]
NDEBUG只能关闭ASSERT（全部大写）这个宏，不会关闭真正的assert
探讨

//Testing the allege() macro

#include <iostream>
#include "ALLEGE.h"
#include <fstream>
#define NDEBUG //turn off asserts
using namespace std;

int main()
{
  int i = 1;
  allege(i,"value ……