c++/1914: parse error at template default arg in ctor

[Richard.Kreckel@Uni-Mainz.DE]

>Number:         1914
>Category:       c++
>Synopsis:       parse error at template default arg in ctor
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Feb 08 10:56:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Richard Kreckel
>Release:        gcc-2.95.2 till sn-20010205
>Organization:
>Environment:
Debian GNU/Linux (potato)
>Description:
Please run the following program thru gcc:

#include <utility>  // defines pair template
#include <iostream>
using namespace std;

typedef pair<int, int> ijpair;

class foo {
public:
	// this does not work,...
	// foo( pair < int, int > ij = pair < int, int > ( 0, 0 ) ) : indices ( ij ) { }
	// ...but this does:
	foo( pair<int,int> ij = ijpair(0,0) ) : indices(ij) { }
	void displayme() { cout << indices.first << ',' << indices.second << endl; }
private:
	pair<int, int> indices;
};

int pairsum(pair<int,int> ij = pair<int,int>(0,0))
{
	return ij.first+ij.second;
}

int main(void)
{
	foo f1 = foo(pair<int, int>(42,7));
	foo f2 = foo();
	f1.displayme();
	f2.displayme();
	cout << pairsum() << endl;
	return 0;
}

The ctor with a default argument causes a parse error, but only
if we say pair<int, int>, and it works if we use the typedefed
ijpair.  It is somewhat confusing that it works for the function
call, though.  I first thought that a digraph or trigraph is
hitting me but inserting spaces does not help at all.  I tried 
the above example on Portland Group C++ compiler 3.1-3, 
SGI MIPSpro 7.30, Compaq C V6.1 and a compiler by HP where it
worked fine with the ctor with default pair<int, int>.
>How-To-Repeat:

>Fix:
unknown
>Release-Note:
>Audit-Trail:
>Unformatted: