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Re: nested C++ classes

Francisco Tolmasky wrote:
| I'm not sure if this is a C++ issue or a project builder issue since I
| seem to remember it happening in Codewarrior too, but why does this
| work:
|
| class someClass
| {
| class nested
| {
| //...
| int a(void) const { return 1; }
| };
|
| //...
| }
|
| but this tells me a() is not defined:
|
| in .h:
|
| class someClass
| {
| class nested
| {
| //...
| int a(void) const;
| };
|
| //...
| }
|
| in .cpp:
|
| int someClass::nested::a(void) const
| {
| return 1;
| }
|
| Any help is greatly appreciated, thanks in advance,

Try posting the simplest *complete* example you can of code that demonstrates the problem (that is, something we could cut and paste into a file and compile and see the problem), and quote the *exact* error message. (Make sure we know which line in the source code produces the error message.) Merely saying that "this tells me a() is not defined" doesn't tell us anything, because we have no context--we don't know what you did that made the message appear. There could be any of a variety of causes for the problem. Since we don't know exactly what you're doing, all we can do is speculate. (For instance, it makes a big difference whether it's the compiler or the linker saying that a() is undefined.)

FYI: it's generally regarded as bad C++ style to write "a(void)" instead of just "a()". This is one of the differences between C and C++: C interprets "a()" to mean "whether a() takes arguments or not is unspecified", while C++ interprets "a()" to mean "a() takes no arguments".

Glen Fisher
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References: 
 >nested C++ classes (From: Francisco Tolmasky <email@hidden>)



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