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c++ - template arguments

reply Christof Meerwald <cmeerw web.de> writes:
See 14.3 Template arguments [temp.arg], paragraph 2, of the C++ standard:

#include <stdio.h>

template<class T> int f()
{
  return 0;
}

template<int I> int f()
{
  return 1;
}

int main()
{
  printf("%d\n", f<int()>()); // int() is a type-id: call the first f()
}


DM calls the second f().


bye, Christof

-- 
http://cmeerw.org                                 JID: cmeerw jabber.at
mailto cmeerw at web.de

...and what have you contributed to the Net?
Dec 14 2002
parent Christof Meerwald <cmeerw web.de> writes:
template<typename T>
struct A
{
  A(T *t)
    : t(t)
  { }

  int f()
  {
    return t(0);
  }

  T *t;
};

int f(int x)
{
  return x;
}

int main()
{
  A<int(int)> a(f);
  // Error: ')' expected
  a.f();

  return 0;
}


I guess this should also be allowed as a template argument (it's at least
the preferred syntax for Boost.Function).


bye, Christof

-- 
http://cmeerw.org                                 JID: cmeerw jabber.at
mailto cmeerw at web.de

...and what have you contributed to the Net?
Dec 22 2002