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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 does the :: mean in C++? - Stack Overflow What does this symbol mean? AirlineTicket::AirlineTicket ()@PaulR Not everyone who arrives upon this question is looking to learn C++ I, for example, just happened to be skimming some C++ code and wanted to get the general idea of what the program is doing and needed a quick reference :)
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
how does the ampersand( ) sign work in c++? - Stack Overflow Possible Duplicate: What are the differences between pointer variable and reference variable in C++? This is confusing me: class CDummy { public: int isitme (CDummy amp; param); }; int CD
C++ code file extension? What is the difference between . cc and . cpp 95 cpp is the recommended extension for C++ as far as I know Some people even recommend using hpp for C++ headers, just to differentiate from C Although the compiler doesn't care what you do, it's personal preference
c++ - How do you loop through a std::map? - Stack Overflow I want to iterate through each element in the map lt;string, int gt; without knowing any of its string-int values or keys What I have so far: void output(map lt;string, int gt; table) { m