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Passing by reference in C
...uch as void func(int* p)) is pass-by-address.
This is pass-by-reference in C++ (won't work in C):
void func(int& ref) {ref = 4;}
...
int a;
func(a);
// a is 4 now
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Iterate keys in a C++ map
Is there a way to iterate over the keys, not the pairs of a C++ map?
19 Answers
19
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Initialize parent's protected members with initialization list (C++)
...e class). This causes the something member to be default initialized.
From C++0x draft:
12.6.2 Initializing bases and members
2 Names in a mem-initializer-id are
looked up in the scope of the
constructor’s class and, if not found
in that scope, are looked up in the
scope containing the constructo...
What is the use of making constructor private in a class?
...lass();
return *aGlobalInst;
}
};
C. (Only applies to the upcoming C++0x standard) You have several constructors. Some of them are declared public, others private. For reducing code size, public constructors 'call' private constructors which in turn do all the work. Your public constructors ...
When is a C++ destructor called?
Basic Question: when does a program call a class' destructor method in C++? I have been told that it is called whenever an object goes out of scope or is subjected to a delete
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C++ equivalent of Java's toString?
... stream, i.e. cout , for an object of a custom class. Is that possible in C++? In Java you could override the toString() method for similar purpose.
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C++ Best way to get integer division and remainder
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@Cookie : C++03 has no concept of long long, but it's highly likely that your compiler has a long long overload of std::div as an extension.
– ildjarn
Aug 15 '11 at 20:40
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Is C++14 adding new keywords to C++?
The C++ Standards Committee tends to shy away from adding new keywords to the language, yet with C++11 that was not the case. Some examples:
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C++ valarray vs. vector
...rrays (value arrays) are intended to bring some of the speed of Fortran to C++. You wouldn't make a valarray of pointers so the compiler can make assumptions about the code and optimise it better. (The main reason that Fortran is so fast is that there is no pointer type so there can be no pointer al...
C++ template constructor
...finitely not in Johannes' words. If they sound humorless then just because C++ is humorless.
– Andreas Spindler
Sep 8 '16 at 10:12
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