• Oleg (5/5) Aug 28 2015 Hello!
• John Colvin (3/8) Aug 28 2015 I'm pretty sure you can just take the address of the first
• Oleg (5/13) Aug 28 2015 I've tried, it throws
• John Colvin (3/16) Aug 28 2015 That's unexpected. Could you provide a full example that does
• Oleg (4/21) Aug 28 2015 I found solution. I call length instead of reserve. It calls
• Oleg (4/7) Aug 28 2015 Oh, reserve calls it too. My mistake.

"Oleg" <gaolong i.ua> writes:

Hello!
Is it possible to get pointer to a data in std.container.Array 
like .ptr from an array? I need to pass a pointer to some C 
function (from DerelictGL3 binding) and avoid GC allocation.
Thank you!

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

On Friday, 28 August 2015 at 17:45:21 UTC, Oleg wrote:
 Hello!
 Is it possible to get pointer to a data in std.container.Array 
 like .ptr from an array? I need to pass a pointer to some C 
 function (from DerelictGL3 binding) and avoid GC allocation.
 Thank you!

I'm pretty sure you can just take the address of the first 
element, e.g. &a[0] or &a.front

"Oleg" <gaolong i.ua> writes:

On Friday, 28 August 2015 at 18:21:04 UTC, John Colvin wrote:
 On Friday, 28 August 2015 at 17:45:21 UTC, Oleg wrote:
 Hello!
 Is it possible to get pointer to a data in std.container.Array 
 like .ptr from an array? I need to pass a pointer to some C 
 function (from DerelictGL3 binding) and avoid GC allocation.
 Thank you!

 I'm pretty sure you can just take the address of the first 
 element, e.g. &a[0] or &a.front

I've tried, it throws
core.exception.RangeError /usr/include/dmd/phobos/std/container/array.d(571):
Range violation

If I make an array from the Array container with foreach ad pass 
it's .ptr - it works

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

On Friday, 28 August 2015 at 18:31:00 UTC, Oleg wrote:
 On Friday, 28 August 2015 at 18:21:04 UTC, John Colvin wrote:
 On Friday, 28 August 2015 at 17:45:21 UTC, Oleg wrote:
 Hello!
 Is it possible to get pointer to a data in 
 std.container.Array like .ptr from an array? I need to pass a 
 pointer to some C function (from DerelictGL3 binding) and 
 avoid GC allocation.
 Thank you!

 I'm pretty sure you can just take the address of the first 
 element, e.g. &a[0] or &a.front

 I've tried, it throws
 core.exception.RangeError /usr/include/dmd/phobos/std/container/array.d(571):
Range violation

That's unexpected. Could you provide a full example that does 
this?

"Oleg" <gaolong i.ua> writes:

On Friday, 28 August 2015 at 18:40:33 UTC, John Colvin wrote:
 On Friday, 28 August 2015 at 18:31:00 UTC, Oleg wrote:
 On Friday, 28 August 2015 at 18:21:04 UTC, John Colvin wrote:
 On Friday, 28 August 2015 at 17:45:21 UTC, Oleg wrote:
 Hello!
 Is it possible to get pointer to a data in 
 std.container.Array like .ptr from an array? I need to pass 
 a pointer to some C function (from DerelictGL3 binding) and 
 avoid GC allocation.
 Thank you!

 I'm pretty sure you can just take the address of the first 
 element, e.g. &a[0] or &a.front

 I've tried, it throws
 core.exception.RangeError /usr/include/dmd/phobos/std/container/array.d(571):
Range violation

 That's unexpected. Could you provide a full example that does 
 this?

I found solution. I call length instead of reserve. It calls 
ensureInitialized and everything works fine. By default, Array 
won't initialize store.

"Oleg" <gaolong i.ua> writes:

On Friday, 28 August 2015 at 18:46:23 UTC, Oleg wrote:

 I found solution. I call length instead of reserve. It calls 
 ensureInitialized and everything works fine. By default, Array 
 won't initialize store.

Oh, reserve calls it too. My mistake.
I found the problem, that's because I passed an empty Array (like 
Array!int.init).