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  • What is the lt;= gt; (spaceship, three-way comparison) operator in C++?
    This is called the three-way comparison operator According to the P0515 paper proposal: There’s a new three-way comparison operator, <=> The expression a <=> b returns an object that compares <0 if a < b, compares >0 if a > b, and compares ==0 if a and b are equal equivalent To write all comparisons for your type, just write operator<=> that returns the appropriate category type: Return
  • What is the purpose of using #ifdef and #if in C++?
    The meaning of #ifdef is that the code inside the block will be included in the compilation only if the mentioned preprocessor macro is defined Similarly, #if means that the block will be included only if the expression evaluates to true (when replacing undefined macros that appears in the expression with 0) One important point here is that the preprocessor processes the source before it's
  • Regular cast vs. static_cast vs. dynamic_cast - Stack Overflow
    I've been writing C and C++ code for almost twenty years, but there's one aspect of these languages that I've never really understood I've obviously used regular casts i e MyClass *m = (MyClass
  • What does the C++ standard say about the size of int, long?
    I'm looking for detailed information regarding the size of basic C++ types I know that it depends on the architecture (16 bits, 32 bits, 64 bits) and the compiler But are there any standards for
  • Why are #ifndef and #define used in C++ header files?
    I have been seeing code like this usually in the start of header files: #ifndef HEADERFILE_H #define HEADERFILE_H And at the end of the file is #endif What is the purpose of this?





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