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How to sum up elements of a C++ vector?
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Actually there are quite a few methods.
int sum_of_elems = 0;
C++03
Classic for loop:
for(std::vector<int>::iterator it = vector.begin(); it != vector.end(); ++it)
sum_of_elems += *it;
Using a standard algorithm:
#include <numeric>
sum_of_elems = std::accumulat...
What are the rules for calling the superclass constructor?
What are the C++ rules for calling the superclass constructor from a subclass one?
10 Answers
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Elegant solution to duplicate, const and non-const, getters? [duplicate]
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I recall from one of the Effective C++ books that the way to do it is to implement the non-const version by casting away the const from the other function.
It's not particularly pretty, but it is safe. Since the member function calling it is non-const, the ob...
Visual Studio 2010 - C++ project - remove *.sdf file
...d in the same folder)
Go to Tools -> Options -> Text Editor -> C/C++ -> Advanced
In the "Fallback Location", set "Always Use Fallback Location" to True and "Do Not Warn If Fallback Location Used" to True.
In "Fallback Location" you can either put a path like C:\Temp or if you leave i...
How to navigate through a vector using iterators? (C++)
...e following is an example of a typical access pattern (earlier versions of C++):
int sum = 0;
using Iter = std::vector<int>::const_iterator;
for (Iter it = vec.begin(); it!=vec.end(); ++it) {
sum += *it;
}
The advantage of using iterator is that you can apply the same pattern with other...
How are GCC and g++ bootstrapped?
...any case the B compiler was written in assembly. Similarly, the first ever C++ compiler (CPre/Cfront, 1979-1983) were probably first implemented in C, then rewritten in C++.
When you compile GCC or any other self-hosting compiler, the full order of building is:
Build new version of GCC with exist...
Why do we need virtual functions in C++?
I'm learning C++ and I'm just getting into virtual functions.
26 Answers
26
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How to easily map c++ enums to strings
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Actually this answer is largely obsolete with C++11.
– Alastair
Jan 27 '15 at 14:28
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show 1 more comment
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What is __declspec and when do I need to use it?
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This is a Microsoft specific extension to the C++ language which allows you to attribute a type or function with storage class information.
Documentation
__declspec (C++)
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How do you copy the contents of an array to a std::vector in C++ without looping?
...st an iterator, and the vector assignment would be failry general (and the C++/STL way).
– MP24
Nov 6 '08 at 21:18
6
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