• Enjoys Math (13/13) Sep 21 2015 I've got:
• =?UTF-8?Q?Ali_=c3=87ehreli?= (55/67) Sep 21 2015 It is much more efficient if you can show the problem in minimal code. :...

Enjoys Math <enjoysmath gmail.com> writes:

I've got:
alias ProgramResultsQueue(O,I) = 
BinaryHeap!(Array!(Results!(O,I)), compareResults);

outside the class ProgramOptimizer.  Inside the class I have:

ProgramResultsQueue!(O,I) programResultsQ = 
heapify!(compareResults, 
Array!(Results!(O,I)))(Array!(Results!(O,I)), 0);

at class scope (not in a function or ctor).

Error:
cannot pass type Array!(Results(int,float)) as a function 
argument.  When I add () to Array!(Results!(O,I)) I get some 
weird error in the library that can't be helped either.

Please guide me!

=?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:

It is much more efficient if you can show the problem in minimal code. :)

Here is minimal code that demonstrates the problem:

import std.container;

struct Results(O, I)
{}

bool compareResults(O, I)(Results!(O, I) lhs, Results!(O, I) rhs)
{
     return lhs == rhs;
}

alias ProgramResultsQueue(O,I) =
     BinaryHeap!(Array!(Results!(O,I)), compareResults);

class ProgramOptimizer(O, I)
{
     ProgramResultsQueue!(O,I) programResultsQ =
         heapify!(compareResults, 
Array!(Results!(O,I)))(Array!(Results!(O,I)),
                                                         0);
}

void main()
{
     auto p = new ProgramOptimizer!(int, float);
}

On 09/21/2015 04:37 PM, Enjoys Math wrote:
 I've got:
 alias ProgramResultsQueue(O,I) = BinaryHeap!(Array!(Results!(O,I)),
 compareResults);

 outside the class ProgramOptimizer.  Inside the class I have:

 ProgramResultsQueue!(O,I) programResultsQ = heapify!(compareResults,
 Array!(Results!(O,I)))(Array!(Results!(O,I)), 0);

 at class scope (not in a function or ctor).

You cannot execute code inside the body of a class other than simple 
initialization of members when it's possible to do so at compile time. 
In general, members are initialized in the constructor.

 Error:
 cannot pass type Array!(Results(int,float)) as a function argument.

You are passing 'types' but heapify's function parameter takes a storage 
and an initial size:



(Types cannot be function arguments anyway.)

 When I add () to Array!(Results!(O,I)) I get some weird error in the
 library that can't be helped either.

 Please guide me!

The following at least compiles:

import std.container;

struct Results(O, I)
{}

bool compareResults(O, I)(Results!(O, I) lhs, Results!(O, I) rhs)
{
     return lhs == rhs;
}

alias ProgramResultsQueue(O,I) =
     BinaryHeap!(Array!(Results!(O,I)), compareResults);

class ProgramOptimizer(O, I)
{
     Array!(Results!(O, I)) store;
     ProgramResultsQueue!(O,I) programResultsQ;

     this()
     {
         programResultsQ =
             heapify!(compareResults, Array!(Results!(O,I)))(store, 100);
     }
}

void main()
{
     auto p = new ProgramOptimizer!(int, float);
}

Ali