Question: I use a (C) library with functions taking different parameters but always returning an int greater than zero in case of error:

```
int functionA(int param1, char param2); /* return an error code on failure, 0 otherwise */
int functionB(LIB_BOOLEAN param1);      /* return an error code on failure, 0 otherwise */
// ...

```

I would like to turn them all to be exception ready:

```
if (functionA(param1, param2) > 0)
{ throw std::runtime_error("Method failed"); }

```

Is it possible to write a template to do it once for all method ?

EDIT:
The idea is to avoid checking the result for each functions every time I use them.

Answer: 
I know I'll get downvoted for this, but I honestly think this is one case where the preprocessor can usefully be used:

```
#define CHECK( fn ) \
    { \
        if( fn > 0 ) { \
            throw "problem"; \
        } \
    } 

int f(int x) {
    return x - 1;
}

int main() {
    CHECK( f(42) );
}

```

It's clear, it's short, it's simple, and it could be made to make use of the `__LINE__`, `__FILE__` and other pre-defined macros, which you can't do with templates.
```
template <typename ... A> void executeFunction(int(*func_ptr)(A...), A...) {
   if (func_ptr(A...) > 0)
     throw std::runtime_error("Method failed"); 
}

int func(int A, int B) {
}

int main() {
    int a, b;
    a = 0;
    b = 4;
    executeFunction(func, a, b)
}

```

Not tested but something like this should work.

Hope it helps!