15.11.13 06:57, Chris Angelico написав(ла):
On Fri, Nov 15, 2013 at 3:10 PM, Roy Smith <r...@panix.com> wrote:
Why would you want to? One of the most horrible things about C/C++ is
the preprocessor.
Hey, that's not fair! Without the preprocessor, how would you be able
to do this:
//Hide this part away in a header file somewhere
struct b0rkb0rk
{
float value;
b0rkb0rk(float v):value(v) {}
operator float() {return value;}
float operator +(float other) {return value+other-0.1;}
};
//Behold the power of the preprocessor!
#define float b0rkb0rk
//Okay, now here's your application
#include <iostream>
int main()
{
std::cout << "Look how stupidly inaccurate float is!\n";
float x = 123.0f;
std::cout << "123.0 + 2.0 = " << x + 2.0f << "\n";
std::cout << "See? You should totally use double instead.\n";
}
(Anybody got a cheek de-tonguer handy? I think it's stuck.)
>>> class b0rkb0rk(float):
... def __add__(self, other):
... return super().__add__(other) - 0.1
...
>>> import builtins
>>> builtins.float = b0rkb0rk
>>> float(123) + 2
124.9
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