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How to forward declare a template class in namespace std?
...ementing an OSI Layer (slider window, Level 2) for a network simulation in C++ (Eclipse Juno). I had frames (template <class T>) and its states (state pattern, forward declaration).
The solution is as follows:
In the *.cpp file, you must include the Header file that you forward, i.e.
ifndef...
Why can't I define a default constructor for a struct in .NET?
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Shorter explanation: In C++, struct and class were just two sides of the same coin. The only real difference is one was public by default and the other was private. In .Net, there is a much greater difference between a struct and a class, and it's...
What is the difference between Cygwin and MinGW?
I want to make my C++ project cross platform, and I'm considering using Cygwin/MinGW.
But what is the difference between them ?
...
What does the explicit keyword mean?
What does the explicit keyword mean in C++?
11 Answers
11
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Does the 'mutable' keyword have any purpose other than allowing the variable to be modified by a con
...tes a value the first time it is requested, and caches the result.
Since c++11 mutable can be used on a lambda to denote that things captured by value are modifiable (they aren't by default):
int x = 0;
auto f1 = [=]() mutable {x = 42;}; // OK
auto f2 = [=]() {x = 42;}; // Error: a by-v...
Python 3.x rounding behavior
... pretty much universally these days", would you (or anyone else) know if C/C++/Java/Perl or any other "main-stream" languages implement rounding the same way?
– Levon
May 31 '12 at 0:26
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NULL vs nil in Objective-C
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nil should only be used in place of an id, what we Java and C++ programmers would think of as a pointer to an object. Use NULL for non-object pointers.
Look at the declaration of that method:
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object
change:(NSDictio...
What is difference between sjlj vs dwarf vs seh?
... not support SEH yet. [...]
See also:
Exception handling models of GCC
C++ Exception Handling for IA-64
EH newbies howto
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How do I set the path to a DLL file in Visual Studio?
...ude it in the list under Library Directories on the Config Properties->VC++ Directories setting).
– Foster Boondoggle
Apr 19 '18 at 17:48
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What is uintptr_t data type
...y means that it's the same size as a pointer.
It is optionally defined in C++11 and later standards.
A common reason to want an integer type that can hold an architecture's pointer type is to perform integer-specific operations on a pointer, or to obscure the type of a pointer by providing it as a...