yet another template instantiation problem (w/ short snapshot :)
Max Lawson
mlawson@drfmc.ceng.cea.fr
Thu Oct 30 08:54:00 GMT 1997
Hi !
The following program doesn't compile with egcs-971023 on a
i586-pc-linux-glibc1 box (libc5.4.39; boot_cflags="-g -O2")
Here's the source file:
----------------z.cc-----------------------------------------------
#include <iostream.h>
template<class O, class T>
class mu_mem_fun_mvars
{
private:
O *obj_;
T (O::*m_func_)(const T&);
public:
// constructor
explicit mu_mem_fun_mvars(O& obj, T (O::*m_func)(const T&))
: obj_(&obj), m_func_(m_func)
{ }
// evaluation of the integrand at the "current" point v
T operator() ( const T& v ) { return (obj_->*m_func)(v); }
};
struct foo
{
double f(const double& t) { return 2*t; }
};
foo ff;
template<class F, class T>
T bar( F& z) { return z(1.0); }
int main()
{
cout << bar(mu_mem_fun_mvars(ff,&foo::f)) << endl;
return 0;
}
--------------------------------------------------
and the compilation results:
g++ -Wall -g -O6 z.cc
z.cc: In function `int main()':
z.cc:38: warning: implicit declaration of function `int mu_mem_fun_mvars(...)'
z.cc:38: warning: cannot pass objects of type `double (foo::*)(const double &)' through `...'
z.cc:38: incomplete type unification
z.cc:38: no matching function for call to `bar (int)'
=> Could sbdy explain me why the call to the class "mu_mem_fun_mvars"
constructor isn't handled the right way ?
This behaviour, IMHO, in a larger source make cc1plus have a fatal signal 11 :(
Thanx in advance, Max
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