UnorderedSets

Keybinding Markup

---
title: UnorderedSets
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*   Using complex to define unordered sets?

# Example

## Source

1  #include <stdio.h>
         2  #include <complex.h>
         3  
         4  typedef complex int unordered_i; // non-standard!
         5  typedef complex double unordered;
         6  
         7  #define S1 ((unordered)(1*I))  // GCC-extension!
         8  static const unordered S2 = (2*I);  // GCC-extension!
         9  static unordered state = S2; // non-const initializer!
        10  
        11  
        12  int main(void)
        13  {
        14      if (state != S2) return 1;
        15      if (state > S1) return 2; // Compiler error - our objective!
        16  
        17      return 0;
        18  }
        19

## GCC

$ c99 --version
    gcc (Debian 4.3.2-1.1) 4.3.2
    $ c99 -std=c99 --pedantic -o unordered unordered.c 
    unordered.c:4: warning: ISO C does not support complex integer types
    unordered.c:8:32: warning: imaginary constants are a GCC extension
    unordered.c:9: error: initializer element is not constant
    unordered.c:15:17: warning: imaginary constants are a GCC extension
    unordered.c: In function main:
    unordered.c:15: error: invalid operands to binary > (have unordered and complex double)

---
title: UnorderedSets
---
 
 
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