Memoizing a templated function

Mon, 16 Apr 2012 17:29:28 -0700

Memoizing a templated version of a function doesn't seem to work, how would I do it properly? For example: 

int test(int n)
{
    return //Do memoizable stuff
}

T test2(T)(T n)
{
    return //Do memoizable stuff
}

void main()
{
    n = memoize!test(n); //is fine
    n = test2(n); //is fine
    n = memoize!test2(n); //gives errors
}
Error 1 Error: template instance ReturnType!(test) ReturnType!(test) does not match template declaration ReturnType(func...) if (func.length == 1 && isCallable!(func)) z:\Dlang\dmd2\src\phobos\std\functional.d 693 Error 2 Error: ReturnType!(test) is used as a type z:\Dlang\dmd2\src\phobos\std\functional.d 693 Error 3 Error: template instance ParameterTypeTuple!(test) ParameterTypeTuple!(test) does not match template declaration ParameterTypeTuple(func...) if (func.length == 1 && isCallable!(func)) z:\Dlang\dmd2\src\phobos\std\functional.d 694 Error 4 Error: ParameterTypeTuple!(test) is used as a type z:\Dlang\dmd2\src\phobos\std\functional.d 693 Error 5 Error: index is not a type or an expression z:\Dlang\dmd2\src\phobos\std\functional.d 695 Error 6 Error: template std.typecons.tuple does not match any function template declaration z:\Dlang\dmd2\src\phobos\std\functional.d 696 Error 7 Error: template std.typecons.tuple(T...) cannot deduce template function from argument types !()(_error_) z:\Dlang\dmd2\src\phobos\std\typecons.d 687 Error 8 Error: template main.test does not match any function template declaration z:\Dlang\dmd2\src\phobos\std\functional.d 703 Error 9 Error: template main.test(T) cannot deduce template function from argument types !()(_error_) C:\Documents and Settings\Adam.LAPPY\My Documents\Visual Studio 2008\Projects\d\test2\test2\main.d 5 Error 10 Error: template instance std.functional.memoize!(test) error instantiating C:\Documents and Settings\Adam.LAPPY\My Documents\Visual Studio 2008\Projects\d\test2\test2\main.d 12 Error 11 Error: forward reference to memoize C:\Documents and Settings\Adam.LAPPY\My Documents\Visual Studio 2008\Projects\d\test2\test2\main.d 12

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