Page History

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Code Block

bgColor	#FFCCCC
lang	c

#define assign(uc1, uc2, val) uc1##uc2 = val;

void func(void) {
  int \u0401;
  /* ... */
  assign( \u04, 01, 4);

  /* ... */
}

This code compiles and runs with Microsoft Visual Studio 2012, assigning 4 to the variable as expected.

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Code Block

bgColor	#ccccff
lang	c

#define assign(ucn, val) ucn = val;
void func(void) {
  int \u0401;
  /* ... */
  assign( \u0401, 4);

  /* ... */
}

Risk Assessment

Creating a universal character name through token concatenation results in undefined behavior.

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