Using :: (scope resolution operator) in C++ - Stack Overflow
I am learning C++ and I can never tell when I need to use :: . I do know that I need to use std:: in front of cout and cin. Does this mean that inside of the iostream file the developers that creat...
What does '&' do in a C++ declaration? - Stack Overflow
The & operator does the same thing in C and C++: it takes the address of an object. The & in a function prototype is not an operator. I'll fix the title.
c++ - Difference between | and || , or & and && - Stack Overflow
Dec 28, 2015 · You'll need to complete a few actions and gain 15 reputation points before being able to upvote. Upvoting indicates when questions and answers are useful. What's reputation …
What is the meaning of prepended double colon - Stack Overflow
I found this line of a code in a class which I have to modify: ::Configuration * tmpCo = m_configurationDB;//pointer to current db and I don't know what exactly means the double …
What is the <=> ("spaceship", three-way comparison) operator in …
Nov 24, 2017 · 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 …
Storing C++ template function definitions in a .CPP file
The problem you describe can be solved by defining the template in the header, or via the approach you describe above. I recommend reading the following points from the C++ FAQ …
How to use the PI constant in C++ - Stack Overflow
Nov 13, 2009 · I want to use the PI constant and trigonometric functions in some C++ program. I get the trigonometric functions with include <math.h>. However, there doesn't seem to be …
What is the difference between a .cpp file and a .h file?
May 17, 2009 · The .cpp file is the compilation unit: it's the real source code file that will be compiled (in C++). The .h (header) files are files that will be virtually copied/pasted in the .cpp …
c++ - (->) arrow operator and (.) dot operator , class pointer
Jul 18, 2013 · In C++ we know that for a pointer of class we use (->) arrow operator to access the members of that class like here: #include <iostream> using namespace std; class …
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& param); }; int …