- 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 colon prepended to
- c++ - Difference between | and || , or and - Stack Overflow
Closed 9 years ago These are two simple samples in C++ written on Dev-cpp C++ 5 4 2:
- 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
- c++ faq - When do I use a dot, arrow, or double colon to refer to . . .
The three distinct operators C++ uses to access the members of a class or class object, namely the double colon ::, the dot , and the arrow ->, are used for three different scenarios that are always well-defined Knowing this allows you to immediately know quite a lot about a and b just by looking at a::b, a b, or a->b, respectively, in any code you look at a::b is only used if b is a member
- 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
- 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
- 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
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