http://d.puremagic.com/issues/show_bug.cgi?id=7521

           Summary: Add const inference for templated method and delegate
                    parameters
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: timon.gehr@gmx.ch


--- Comment #0 from timon.gehr@gmx.ch 2012-02-16 07:50:25 PST ---
Not only pure/nothrow/@safe should be inferred, but const on parameters and methods should be inferred too. This increases the expressiveness of alias parameters and is required for making templates const correct. Inferring const for delegate parameters reduces the annotation overhead and makes treatment of template delegate literals uniform with normal delegate literals.

IOW, the following code should compile:

int glob;

class Foo(alias a){
    int x;
    void foo(){a(this);}
    static int bar(Foo x){return a(foo);}
}

void main(){
    alias Foo!((p){glob=p.x;}) T; // parameter p inferred const
    auto foo = new immutable(T);
    foo.foo();  // OK, T.foo inferred const
    T.bar(foo); // OK, parameter x of T.bar inferred const
    (T x){glob = x.x;}(foo); // OK, parameter x inferred const
}

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--- Comment #1 from timon.gehr@gmx.ch 2012-02-16 07:59:35 PST ---
The original example contained some mistakes, second try:

int glob;

class Foo(alias a){
    int x;
    void foo(){a(this);}
    static void bar(Foo x){a(x);}
}

void main(){
    alias Foo!((a){glob=a.x;}) T; // parameter a inferred const
    auto foo = new immutable(T);
    foo.foo();  // OK, foo inferred const
    T.bar(foo); // OK, parameter x inferred const
    (T x){glob = x.x;}(foo); // ok, parameter x inferred const
}

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--- Comment #2 from timon.gehr@gmx.ch 2012-02-25 07:06:34 PST ---
This probably shouldn't be done for virtual functions of templated classes.

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