Page History

typedef char True;
typedef struct { char a[2]; } False;

template <typename T>&lt;typename T&gt;
True isPtr(T *);

False isPtr(...);

#define is_ptr(e) (sizeof(isPtr(e)) == sizeof(True))

#include <cstdarg>&lt;cstdarg&gt;

char *concatenate(char const *s, ...)
    {
    // code to actually concatenate the strings
    }

char *separator = /* some reasonable value */;

char *t = concatenate("hello"&quot;hello&quot;, separator, "world"&quot;world&quot;, NULL);

char *u = concatenate("hello""hello", separator, "world""world"); // undefined behavior

char *v = concatenate("hello""hello", ' ', "world""world", NULL); // undefined behavior

#include <string>&lt;string&gt;

string separator = /* some reasonable value */;

string s = "hello"&quot;hello&quot; + separator + "world"&quot;world&quot;;