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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
- 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
- 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
- c++ - How do I find the length of an array? - Stack Overflow
Is there a way to find how many values an array has? Detecting whether or not I've reached the end of an array would also work
- What is the meaning of the auto keyword? - Stack Overflow
auto was a keyword that C++ "inherited" from C that had been there nearly forever, but virtually never used because there were only two possible conditions: either it wasn't allowed, or else it was assumed by default The use of auto to mean a deduced type was new with C++11 At the same time, auto x = initializer deduces the type of x from the type of initializer the same way as template type
- 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
- Visual Studio Code: How to configure includePath for better . . .
From the official documentation of the C C++ extension: Configuring includePath for better IntelliSense results If you're seeing the following message when opening a folder in Visual Studio Code, it means the C++ IntelliSense engine needs additional information about the paths in which your include files are located Where are the include paths defined? The include paths are defined in the
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