• John (4/4) May 21 2015 I've been rewriting one of my emulators in D and am fairly new to
• Adam D. Ruppe (11/11) May 21 2015 Start with a function type declaration:
• John (2/13) May 21 2015 Thanks! Holy moly you guys are quick in here.
• John Colvin (20/24) May 21 2015 float foo(int a, float b)

"John" <typ3def gmail.com> writes:

I've been rewriting one of my emulators in D and am fairly new to 
the language. I'm having trouble finding documentation on 
creating/initializing/use of arrays of function pointers in D. If 
anyone has a code example I'd appreciate it!

"Adam D. Ruppe" <destructionator gmail.com> writes:

Start with a function type declaration:

void function() func_ptr;

Then make an array out of it:

void function()[] func_ptr_array;


It works like other arrays, just the [] might be a little harder 
to see since it is a much longer type signature. But it is still 
in there, right after it, similarly to int[].

Then the array is indexed and set like normal. You can change 
length on it (auto initializes all members to null), ~= &my_func 
to append, etc.

You can also do associative arrays of function pointers btw.

"John" <typ3def gmail.com> writes:

On Thursday, 21 May 2015 at 16:25:24 UTC, Adam D. Ruppe wrote:
 Start with a function type declaration:

 void function() func_ptr;

 Then make an array out of it:

 void function()[] func_ptr_array;


 It works like other arrays, just the [] might be a little 
 harder to see since it is a much longer type signature. But it 
 is still in there, right after it, similarly to int[].

 Then the array is indexed and set like normal. You can change 
 length on it (auto initializes all members to null), ~= 
 &my_func to append, etc.

 You can also do associative arrays of function pointers btw.

Thanks! Holy moly you guys are quick in here.

"John Colvin" <john.loughran.colvin gmail.com> writes:

On Thursday, 21 May 2015 at 16:23:15 UTC, John wrote:
 I've been rewriting one of my emulators in D and am fairly new 
 to the language. I'm having trouble finding documentation on 
 creating/initializing/use of arrays of function pointers in D. 
 If anyone has a code example I'd appreciate it!

float foo(int a, float b)
{
     import std.stdio;
     writeln(a, b);
     return a+b;
}

void main()
{
     float function(int, float)[] arrayOfFPs;

     arrayOfFPs = new float function(int, float)[42];

     arrayOfFPs[0] = &foo;

     auto r = arrayOfFPs[0](3, 7.6);
     assert(r == 3+7.6f);

     alias DT = int delegate(int);

     int a = 4;
     auto arrayOfDelegates = new DT[3];
     arrayOfDelegates[1] = (int x) => a + x;
     assert(arrayOfDelegates[1](3) == 7);
}