• Andrey (33/33) Jul 14 2016 Hi guys!
• Andrey (2/35) Jul 14 2016 to something like - Neurons_layer!(float,5,Sigmoid) nf;
• Lodovico Giaretta (4/47) Jul 14 2016 You don't need Sigmoid!float at all. This will work:
• Andrey (3/6) Jul 14 2016 Yes, default init is present, but double, real types are desirable
• ag0aep6g (19/41) Jul 14 2016 [...]
• Andrey (3/18) Jul 14 2016 WOW! It's works. Thanks.
• Steven Schveighoffer (9/32) Jul 14 2016 You can't pass an uninstantiated template type as a type, but you can

Andrey <avraliov gmail.com> writes:

Hi guys!

Help a newbie please.

Playing with D and trying to understand some features.
Here is my try to carry out my code from C++ project to D

struct Sigmoid(T)
{
   const T Function(T value)
   {
    ...
   }
   const T DerivateFunction(const T value)
   {
    ...
   }
}

struct Neurons_layer(T = float, size_t neurons_num = 0, F = 
Sigmoid!T)
   if(isFloatingPoint!T && is(typeof(F.Function)))
     {
     private:
       static if(neurons_num > 0)
	T[neurons_num] _neurons_arr;
       else
	T[] _neurons_arr;

     private:
       alias Function = F.Function;
}

unittest
{
   Neurons_layer!(float,5,Sigmoid!float) nf;
}


The question is - How to make in pretty way this line:
  Neurons_layer!(float,5,Sigmoid!float) nf;

Andrey <avraliov gmail.com> writes:

On Thursday, 14 July 2016 at 19:27:14 UTC, Andrey wrote:
 Hi guys!

 Help a newbie please.

 Playing with D and trying to understand some features.
 Here is my try to carry out my code from C++ project to D

 struct Sigmoid(T)
 {
   const T Function(T value)
   {
    ...
   }
   const T DerivateFunction(const T value)
   {
    ...
   }
 }

 struct Neurons_layer(T = float, size_t neurons_num = 0, F = 
 Sigmoid!T)
   if(isFloatingPoint!T && is(typeof(F.Function)))
     {
     private:
       static if(neurons_num > 0)
 	T[neurons_num] _neurons_arr;
       else
 	T[] _neurons_arr;

     private:
       alias Function = F.Function;
 }

 unittest
 {
   Neurons_layer!(float,5,Sigmoid!float) nf;
 }


 The question is - How to make in pretty way this line:
  Neurons_layer!(float,5,Sigmoid!float) nf;

to something like - Neurons_layer!(float,5,Sigmoid) nf;

Lodovico Giaretta <lodovico giaretart.net> writes:

On Thursday, 14 July 2016 at 19:28:23 UTC, Andrey wrote:
 On Thursday, 14 July 2016 at 19:27:14 UTC, Andrey wrote:
 Hi guys!

 Help a newbie please.

 Playing with D and trying to understand some features.
 Here is my try to carry out my code from C++ project to D

 struct Sigmoid(T)
 {
   const T Function(T value)
   {
    ...
   }
   const T DerivateFunction(const T value)
   {
    ...
   }
 }

 struct Neurons_layer(T = float, size_t neurons_num = 0, F = 
 Sigmoid!T)
   if(isFloatingPoint!T && is(typeof(F.Function)))
     {
     private:
       static if(neurons_num > 0)
 	T[neurons_num] _neurons_arr;
       else
 	T[] _neurons_arr;

     private:
       alias Function = F.Function;
 }

 unittest
 {
   Neurons_layer!(float,5,Sigmoid!float) nf;
 }


 The question is - How to make in pretty way this line:
  Neurons_layer!(float,5,Sigmoid!float) nf;

 to something like - Neurons_layer!(float,5,Sigmoid) nf;

You don't need Sigmoid!float at all. This will work:

Neurons_layer!(float, 5) nf;

as you provided a default value for the third argument.

Andrey <avraliov gmail.com> writes:

On Thursday, 14 July 2016 at 19:48:20 UTC, Lodovico Giaretta 
wrote:

 You don't need Sigmoid!float at all. This will work:

 Neurons_layer!(float, 5) nf;

 as you provided a default value for the third argument.

Yes, default init is present, but double, real types are desirable

ag0aep6g <anonymous example.com> writes:

On Thursday, 14 July 2016 at 19:28:23 UTC, Andrey wrote:
 On Thursday, 14 July 2016 at 19:27:14 UTC, Andrey wrote:

[...]
 struct Sigmoid(T)
 {


[...]
 }

 struct Neurons_layer(T = float, size_t neurons_num = 0, F = 
 Sigmoid!T)
   if(isFloatingPoint!T && is(typeof(F.Function)))
     {


[...]
     private:
       alias Function = F.Function;
 }

 unittest
 {
   Neurons_layer!(float,5,Sigmoid!float) nf;
 }


 The question is - How to make in pretty way this line:
  Neurons_layer!(float,5,Sigmoid!float) nf;

 to something like - Neurons_layer!(float,5,Sigmoid) nf;

Make F an alias parameter:

----
struct Neurons_layer(T = float, size_t neurons_num = 0, alias F = 
Sigmoid)
   if(isFloatingPoint!T && is(typeof(F!T.Function)))
{
     ...
     private:
       alias Function = F!T.Function;
}

unittest
{
   Neurons_layer!(float,5,Sigmoid) nf;
}
----

Andrey <avraliov gmail.com> writes:

On Thursday, 14 July 2016 at 19:48:38 UTC, ag0aep6g wrote:

 Make F an alias parameter:

 ----
 struct Neurons_layer(T = float, size_t neurons_num = 0, alias F 
 = Sigmoid)
   if(isFloatingPoint!T && is(typeof(F!T.Function)))
 {
     ...
     private:
       alias Function = F!T.Function;
 }

 unittest
 {
   Neurons_layer!(float,5,Sigmoid) nf;
 }
 ----

WOW! It's works. Thanks.
I like D more and more )))

Steven Schveighoffer <schveiguy yahoo.com> writes:

On 7/14/16 3:28 PM, Andrey wrote:
 On Thursday, 14 July 2016 at 19:27:14 UTC, Andrey wrote:

 struct Neurons_layer(T = float, size_t neurons_num = 0, F = Sigmoid!T)
   if(isFloatingPoint!T && is(typeof(F.Function)))
     {
     private:
       static if(neurons_num > 0)
     T[neurons_num] _neurons_arr;
       else
     T[] _neurons_arr;

     private:
       alias Function = F.Function;
 }

 unittest
 {
   Neurons_layer!(float,5,Sigmoid!float) nf;
 }


 The question is - How to make in pretty way this line:
  Neurons_layer!(float,5,Sigmoid!float) nf;

 to something like - Neurons_layer!(float,5,Sigmoid) nf;

You can't pass an uninstantiated template type as a type, but you can 
pass as an alias:

struct Neurons_layer(T = float, size_t neurons_num = 0, alias FTemp = 
Sigmoid)
{
    alias F = FTemp!T;
    ...

-Steve