Re: non type template specialization / recursive

From:

er <erwann.rogard@gmail.com>

Newsgroups:

comp.lang.c++

Date:

Sat, 10 Nov 2007 22:58:45 -0000

Message-ID:

<1194735525.672737.290200@50g2000hsm.googlegroups.com>

On Nov 10, 7:22 am, "Bo Persson" <b...@gmb.dk> wrote:

er wrote:

::
:: following up with this: what i'd like to implement is a recursion,
:: but as below it does not work...
::
:: template<unsigned int M>
:: class A{
:: public:
:: static A<M>& instance();
:: private:
:: A();
:: };
:: template<unsigned int M>
:: A<M>& A<M>::instance(){
:: static A<M> singleton;
:: return singleton;
:: };
:: template<unsigned int M>
:: A<M>::A(){};//WITHOUT RECURSION. FINE
:: //A<M>::A(){A<M-1>& ref = A<M-1>::instance();};//RECURSION. NOT
:: FINE. template<>
:: class A<0>{
:: public:
:: static A<0>& instance(){
:: static A<0> singleton;
:: return singleton;
:: };
:: private:
:: A(){};
:: };
::
:: ../header.hpp: In constructor 'A<M>::A() [with unsigned int M =
:: 1u]': ../header.hpp:15: instantiated from 'static A<M>&
:: A<M>::instance() [with unsigned int M = 1u]'
:: ../main.cpp:5: instantiated from here

You don't show what's in the main() function. Perhaps the problem lies
there?

The code above looks pretty ok to me.

Bo Persson

thanks.

what i have in main() is an instance such as:

A<1>& a1 = A<1>::instance();