bool typedef and binary compatibility

This is a discussion on bool typedef and binary compatibility within the C Programming forums, part of the General Programming Boards category; I was poring over some source code and came across the following: Code: /* Boolean type, assignment (but not necessarily ...

  1. #1
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    bool typedef and binary compatibility

    I was poring over some source code and came across the following:

    Code:
    /* Boolean type, assignment (but not necessarily binary) compatible with
     * C++ bool */
    typedef enum {sox_false, sox_true} sox_bool;
    I understand that this code creates a boolean (true or false) datatype but what does the author mean by his comment on the lack of binary compatibility with C++ bool.

    Does this mean that the C++ built-in bool usually compiles to a size of 1 byte whereas a C bool defined using and enumerated type is essentially an int and therefore usually 2 or 4 bytes in size?

  2. #2
    and the hat of sweating
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    Quote Originally Posted by BattlePanic View Post
    Does this mean that the C++ built-in bool usually compiles to a size of 1 byte whereas a C bool defined using and enumerated type is essentially an int and therefore usually 2 or 4 bytes in size?
    I think that's what it means.

  3. #3
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    Yes, and enum's aren't necessarily binary compatible between different compilers, e.g. one compiler may decide to use short int (2 bytes), and another compiler uses a standard or long int (4 bytes).

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