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  1. What does '&' do in a C++ declaration? - Stack Overflow

    I am a C guy and I'm trying to understand some C++ code. I have the following function declaration:

  2. 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 …

  3. c++ - Difference between | and || , or & and && - Stack Overflow

    Dec 28, 2015 · Closed 9 years ago. These are two simple samples in C++ written on Dev-cpp C++ 5.4.2:

  4. 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 …

  5. c++ - What does the explicit keyword mean? - Stack Overflow

    33 Cpp Reference is always helpful!!! Details about explicit specifier can be found here. You may need to look at implicit conversions and copy-initialization too. Quick look The explicit specifier …

  6. 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 &lt;math.h&gt;. However, there doesn't seem to be …

  7. 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 …

  8. 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 …

  9. 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?

  10. How to generate a random number in C++? - Stack Overflow

    Nov 19, 2012 · I'm trying to make a game with dice, and I need to have random numbers in it (to simulate the sides of the die. I know how to make it between 1 and 6). Using #include …