Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #59500

Re: Implementing #define macros similar to C on python

Show key headers only | View raw

On Fri, Nov 15, 2013 at 3:10 PM, Roy Smith <roy@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.)

ChrisA

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Implementing #define macros similar to C on python JL <lightaiyee@gmail.com> - 2013-11-14 18:29 -0800
  Re: Implementing #define macros similar to C on python Dave Angel <davea@davea.name> - 2013-11-14 21:30 -0600
  Re: Implementing #define macros similar to C on python Chris Angelico <rosuav@gmail.com> - 2013-11-15 14:49 +1100
    Re: Implementing #define macros similar to C on python JL <lightaiyee@gmail.com> - 2013-11-15 15:36 -0800
      Re: Implementing #define macros similar to C on python Irmen de Jong <irmen.NOSPAM@xs4all.nl> - 2013-11-16 01:20 +0100
      Re: Implementing #define macros similar to C on python Terry Reedy <tjreedy@udel.edu> - 2013-11-15 19:22 -0500
      Re: Implementing #define macros similar to C on python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-16 00:22 +0000
        Re: Implementing #define macros similar to C on python JL <lightaiyee@gmail.com> - 2013-11-15 21:38 -0800
          Re: Implementing #define macros similar to C on python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-16 11:48 +0000
  Re: Implementing #define macros similar to C on python Roy Smith <roy@panix.com> - 2013-11-14 23:10 -0500
    Re: Implementing #define macros similar to C on python Chris Angelico <rosuav@gmail.com> - 2013-11-15 15:57 +1100
    Re: Implementing #define macros similar to C on python Serhiy Storchaka <storchaka@gmail.com> - 2013-11-16 12:02 +0200
  Re: Implementing #define macros similar to C on python Irmen de Jong <irmen.NOSPAM@xs4all.nl> - 2013-11-16 00:20 +0100

csiph-web