[Issue 1820] New: default template parameters cannot be omitted

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=1820

           Summary: default template parameters cannot be omitted
           Product: D
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla at digitalmars.com
        ReportedBy: andrei at metalanguage.com


The following code compiles and runs as expected:

import std.stdio;

template wyda(string pred = ``)
{
    void wyda(int x) { writeln(pred, " ", x); }
}

void main()
{
    wyda(3);
    wyda!("a")(4);
}

However, the following equivalent code does not:

import std.stdio;

template wyda(string pred = ``)
{
    static if (true)
        void wyda(int x) { writeln(pred, " ", x); }
}

void main()
{
    wyda(3);
    wyda!("a")(4);
}

The proposed solution is to get rid to the maximum extent possible of the
requirements for the noisy "!()" syntax. If a template name is specified
without the "!", then it should simply assume "!()" followed.


Andrei


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