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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++?
In my project code, I found that someone used #ifdef and #if in code I would like to know what does purpose for using them? As my knowledge, it said to the preprocessor will not do anything inside
- How can I convert int to string in C++? - Stack Overflow
itoa will be faster than the stream equivalent There are also ways of re-using the string buffer with the itoa method (avoiding heap allocations if you are frequently generating strings e g for some rapidly updating numerical output) Alternatively you can generate a custom streambuf to reduce some of the allocation overhead etc Constructing the stream in the first place is also not a low
- 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
- How to add element to C++ array? - Stack Overflow
I want to add an int into an array, but the problem is that I don't know what the index is now
- 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
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