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Why can't I forward-declare a class in a namespace using double colons?
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Because you can't. In C++ language fully-qualified names are only used to refer to existing (i.e. previously declared) entities. They can't be used to introduce new entities.
And you are in fact "reopening" the namespace to declare new entities. ...
How to see which flags -march=native will activate?
I'm compiling my C++ app using GCC 4.3. Instead of manually selecting the optimization flags I'm using -march=native , which in theory should add all optimization flags applicable to the hardware I'm compiling on. But how can I check which flags is it actually using?
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Grasping the Node JS alternative to multithreading
...in javascript.
Click here to see the video
(Instead of WebAPIs there are C++ APIs in Node.js)
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How is “int* ptr = int()” value initialization not illegal?
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does this go away with C++0x?
– Neil G
Nov 9 '11 at 22:45
@NeilG: ...
Why do you not use C for your web apps?
..., web server (usually C), language interpreter (C), database (usually C or C++). Web application usually only passes data from one part to another, applying some basic operation on it, and it's performance is not crucial at all.
– el.pescado
Jun 20 '10 at 16:40...
Global and local variables in R
...this case bar is accessible from outside the function.
However, unlike C, C++ or many other languages, brackets do not determine the scope of variables. For instance, in the following code snippet:
if (x > 10) {
y <- 0
}
else {
y <- 1
}
y remains accessible after the if-else sta...
Using {} in a case statement. Why?
...atements like the labels used with a goto statement(this is covered in the C++ draft standard section 6.1 Labeled statement) and we can see from section 6.7 paragraph 3 that jumping pass a declaration is not allowed in many cases, including those with an initialization:
It is possible to transfe...
Why do function pointer definitions work with any number of ampersands '&' or asterisks '*'?
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Not the answer you're looking for? Browse other questions tagged c++ c function-pointers or ask your own question.
Scala vs. Groovy vs. Clojure [closed]
... term will become just another marketing term. Might as well start calling C++ functional and Haskell imperative.
– jon-hanson
Aug 22 '09 at 15:19
9
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Returning an array using C
...ck is returning a struct as an array container/object. Think of it like a C++ std::vector. The preprocessor would expand the int version of this to struct intArray { int* contents; int size; };.
– pyrospade
Jan 9 '14 at 4:05
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