#include <stdio.h>
#define cmp(arg, cmp_list) ((Carry_Struct<decltype(arg)>(arg) cmp_list).is_true)
template<typename type>
struct Carry_Struct{
bool is_true;
type value;
Carry_Struct(type in)
{
is_true = true;
value = in;
}
};
#define CREATE_COMPARE(syntax) \
template<typename type> \
Carry_Struct<type> operator syntax (Carry_Struct<type> carry, int compared) \
{ \
if(carry.is_true == false) return carry; /*Short circuit*/ \
if(carry.value syntax compared == false) carry.is_true = false; \
return carry; \
}
CREATE_COMPARE(<)
CREATE_COMPARE(>)
CREATE_COMPARE(<=)
CREATE_COMPARE(>=)
CREATE_COMPARE(==)
CREATE_COMPARE(!=)
// Beware of dragons, != and == must be the last compares,
// elsewise the precedence will not be left to right as it reqires.
// -- Sample of the C precedence problem:
// cmp(1, == 5 < 10) // this does 5 < 10
// cmp(1, == 1) // And now it does 1 == 1
// true // And that becomes true
int main() {
for(char i = 0; i < 16; ++i)
{
if(cmp(i, > 3 <= 12 != 7)) // Magic
{
printf("Pass: %i\n", i);
}
else
{
printf("Fail: %i\n", i);
}
}
return 0;
}
