Re: Mimicking Javas static class initializer in C++

From:

Andreas Wollschlaeger <meister.possel@arcor.de>

Newsgroups:

comp.lang.c++

Date:

Mon, 27 Oct 2008 23:37:00 +0100

Message-ID:

<49064280$0$32682$9b4e6d93@newsspool2.arcor-online.net>

Lars Tetzlaff schrieb:

Andreas Wollschlaeger schrieb:

Hi folks,

as the subject says, i'm a poor Java programmer trying to transfer some
of his wisdom into C++ world... here is what im trying to do this evening:

Java has a nifty feature called a static class initializer - something
like this:

You do not need to allocate every object with new in C++, so if you only
need a vector of Thing, use xx. If you need to allocate Thing on the
heap, use yy;

xx.h:

#include <vector>

class Thing
{
};

class Foo
{
private:
    static std::vector<Thing> xx;
    static class MyVector : public std::vector<Thing*>{ public:
MyVector(); } yy;
};

xx.cpp:

#include <xx.h>

std::vector<Thing> Foo::xx( 42 );
Foo::MyVector::MyVector()
{
    for( int i = 0; i<42; ++i ) {
    yy.push_back( new Thing() );
    }
}

Foo::MyVector Foo::yy;

Well, great, this was just what i have been looking for: encapsulating
the statics initialization in some inner class and its default
constructor - much more elegant and "cplusplusish" than my previous
attempt :-) Tx to you and the other folks, added me some more insight to
C++ this evening!

Cheers
Andreas