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From:Davi Arnaut Date:August 31 2010 7:12pm
Subject:Re: [STYLE] use true/false in C++, not TRUE/FALSE
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On 8/31/10 2:51 PM, Vladislav Vaintroub wrote:
>
>
>> -----Original Message-----
>> From: Roy Lyseng [mailto:roy.lyseng@stripped]
>> Sent: Tuesday, August 31, 2010 7:43 PM
>> To: MARK CALLAGHAN
>> Cc: Davi Arnaut; Jay Pipes; Guilhem Bichot; internals
>> Subject: Re: [STYLE] use true/false in C++, not TRUE/FALSE
>
>
>> The good thing with bool return is that you cannot overload it with additional
>> information...
>
> Why not ? return (bool)42 would return 42 in every C99 implementation of bool, as
> bool is mapped to some integer type  per C99
> standard.
>

This is precisely why we should move away from my_bool on C. The C++ 
bool has special conversion rules: any pointer, enumeration, integral, 
etc can be converted to a bool, with a zero value, or null pointer being 
converted to false, everything else to true.

C has a different rule, whereas there can be truncation. For example, a 
larger int might be truncated when converting to my_bool, resulting in a 
false.

Just say *no* to Boolean in C. I actually worry when I see a return type 
of my_bool and a return value other than TRUE/FALSE. Better stick with a 
simple int in C code.
Thread
[STYLE] use true/false in C++, not TRUE/FALSEGuilhem Bichot26 Aug
  • Re: [STYLE] use true/false in C++, not TRUE/FALSERoy Lyseng26 Aug
  • Re: [STYLE] use true/false in C++, not TRUE/FALSEMARK CALLAGHAN26 Aug
    • Re: [STYLE] use true/false in C++, not TRUE/FALSEGuilhem Bichot31 Aug
      • Re: [STYLE] use true/false in C++, not TRUE/FALSEMARK CALLAGHAN31 Aug
        • Re: [STYLE] use true/false in C++, not TRUE/FALSEGuilhem Bichot31 Aug
          • Re: [STYLE] use true/false in C++, not TRUE/FALSEJay Pipes31 Aug
            • Re: [STYLE] use true/false in C++, not TRUE/FALSEDavi Arnaut31 Aug
              • Re: [STYLE] use true/false in C++, not TRUE/FALSEJay Pipes31 Aug
                • Re: [STYLE] use true/false in C++, not TRUE/FALSEDavi Arnaut31 Aug
                  • Re: [STYLE] use true/false in C++, not TRUE/FALSEMARK CALLAGHAN31 Aug
                    • Re: [STYLE] use true/false in C++, not TRUE/FALSEDavi Arnaut31 Aug
                      • Re: [STYLE] use true/false in C++, not TRUE/FALSEMARK CALLAGHAN31 Aug
                        • Re: [STYLE] use true/false in C++, not TRUE/FALSERoy Lyseng31 Aug
                          • Re: [STYLE] use true/false in C++, not TRUE/FALSEMARK CALLAGHAN31 Aug
                            • Re: [STYLE] use true/false in C++, not TRUE/FALSEMichael Widenius8 Sep
                              • Re: [STYLE] use true/false in C++, not TRUE/FALSEJay Pipes8 Sep
                          • RE: [STYLE] use true/false in C++, not TRUE/FALSEVladislav Vaintroub31 Aug
                            • Re: [STYLE] use true/false in C++, not TRUE/FALSERoy Lyseng31 Aug
                            • Re: [STYLE] use true/false in C++, not TRUE/FALSEDavi Arnaut31 Aug
                              • Re: [STYLE] use true/false in C++, not TRUE/FALSEMichael Widenius8 Sep
                                • Re: [STYLE] use true/false in C++, not TRUE/FALSEDavi Arnaut8 Sep
                                  • RE: [STYLE] use true/false in C++, not TRUE/FALSEVladislav Vaintroub8 Sep
                        • Re: [STYLE] use true/false in C++, not TRUE/FALSEMichael Widenius8 Sep
                      • Re: [STYLE] use true/false in C++, not TRUE/FALSEKonstantin Osipov8 Sep
                        • Re: [STYLE] use true/false in C++, not TRUE/FALSEMats Kindahl8 Sep
                          • Re: [STYLE] use true/false in C++, not TRUE/FALSETor Didriksen8 Sep
                            • Re: [STYLE] use true/false in C++, not TRUE/FALSEMats Kindahl8 Sep
                              • RE: [STYLE] use true/false in C++, not TRUE/FALSEVladislav Vaintroub8 Sep
                                • Re: [STYLE] use true/false in C++, not TRUE/FALSEMats Kindahl8 Sep
                              • Re: [STYLE] use true/false in C++, not TRUE/FALSETor Didriksen8 Sep
                                • Re: [STYLE] use true/false in C++, not TRUE/FALSEMats Kindahl8 Sep
                  • Re: [STYLE] use true/false in C++, not TRUE/FALSEJay Pipes31 Aug
        • Re: [STYLE] use true/false in C++, not TRUE/FALSEMichael Widenius8 Sep
      • Re: [STYLE] use true/false in C++, not TRUE/FALSEMARK CALLAGHAN31 Aug
  • Re: [STYLE] use true/false in C++, not TRUE/FALSEMats Kindahl27 Aug
    • Re: [STYLE] use true/false in C++, not TRUE/FALSEMichael Widenius8 Sep