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Date: Wed, 15 Oct 2003 11:49:00 -0000
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From: "bruno at clisp dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/12615] [3.3 Regression] initializer syntax for POD structs gives parse error
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12615



------- Additional Comments From bruno at clisp dot org  2003-10-15 11:49 -------
Gabriel dos Reis writes: 
> | The problem with this is that it is not a syntax which is valid in 
> | initializers _and_  expressions. I'd need to write  
> 
> The C99 standard syntax works in both cases 
 
No it doesn't. None of the possible syntaxes work both in initializer position 
and in expression position, with g++ 3.3.1: 
 
===================================================== 
struct object 
{ 
  unsigned long one_o; 
  unsigned int allocstamp; 
}; 
typedef struct object object; 
void gc_mark (object obj) 
{ 
  // Old GNU designated initializer syntax, without cast. 
  { 
    // As initializer. 
    object a = { one_o: 0, allocstamp: 0 }; 
    // As expression - syntax error in gcc and g++. 
    object b; b = { one_o: 0, allocstamp: 0 }; 
  } 
  // Old GNU designated initializer syntax, with cast. 
  { 
    // As initializer - syntax error in g++. 
    object a = (object) { one_o: 0, allocstamp: 0 }; 
    // As expression. 
    object b; b = (object) { one_o: 0, allocstamp: 0 }; 
  } 
  // New ISO C 99 designated initializer syntax, without cast. 
  { 
    // As initializer - syntax error in g++. 
    object a = { .one_o = 0, .allocstamp = 0 }; 
    // As expression - syntax error in gcc and g++. 
    object b; b = { .one_o = 0, .allocstamp = 0 }; 
  } 
  // New ISO C 99 designated initializer syntax, with cast. 
  { 
    // As initializer - syntax error in g++. 
    object a = (object) { .one_o = 0, .allocstamp = 0 }; 
    // As expression - syntax error in g++. 
    object b; b = (object) { .one_o = 0, .allocstamp = 0 }; 
  } 
} 
========================================================= 
 
Which of the four syntaxes you recommend me to choose?