• Nikhil Jacob (3/3) Dec 12 2016 Is there any way to check whether a function/delegate passed to a
• Nicholas Wilson (5/8) Dec 12 2016 there is the pure function attribute, how ever this still allows
• Nikhil Jacob (7/16) Dec 12 2016 Make sense.. I have two follow up questions
• Nicholas Wilson (8/28) Dec 12 2016 1. they work the same. Delegates can have any of the function
• Jacob Carlborg (4/6) Dec 12 2016 And it can access immutable global data.
• Nikhil Jacob (2/7) Dec 12 2016 Thank you all for the help

Nikhil Jacob <nikhiljaco gmail.com> writes:

Is there any way to check whether a function/delegate passed to a 
function uses any shared or global variables ?

I could not find any in std.traits.

Nicholas Wilson <iamthewilsonator hotmail.com> writes:

On Monday, 12 December 2016 at 11:02:21 UTC, Nikhil Jacob wrote:
 Is there any way to check whether a function/delegate passed to 
 a function uses any shared or global variables ?

 I could not find any in std.traits.

there is the pure function attribute, how ever this still allows 
you to use globals *if you pass them as parameters to the 
function*.

see https://dlang.org/spec/function.html#pure-functions

Nikhil Jacob <nikhiljaco gmail.com> writes:

On Monday, 12 December 2016 at 11:15:28 UTC, Nicholas Wilson 
wrote:
 On Monday, 12 December 2016 at 11:02:21 UTC, Nikhil Jacob wrote:
 Is there any way to check whether a function/delegate passed 
 to a function uses any shared or global variables ?

 I could not find any in std.traits.

 there is the pure function attribute, how ever this still 
 allows you to use globals *if you pass them as parameters to 
 the function*.

 see https://dlang.org/spec/function.html#pure-functions

Make sense.. I have two follow up questions

1. What about delegates ?
2. If a function is not explicitly declared as pure but satisfies 
the conditions of a pure function then can i check whether the 
function is pure using functionAttributes in std.traits.

Nicholas Wilson <iamthewilsonator hotmail.com> writes:

On Monday, 12 December 2016 at 11:37:04 UTC, Nikhil Jacob wrote:
 On Monday, 12 December 2016 at 11:15:28 UTC, Nicholas Wilson 
 wrote:
 On Monday, 12 December 2016 at 11:02:21 UTC, Nikhil Jacob 
 wrote:
 Is there any way to check whether a function/delegate passed 
 to a function uses any shared or global variables ?

 I could not find any in std.traits.

 there is the pure function attribute, how ever this still 
 allows you to use globals *if you pass them as parameters to 
 the function*.

 see https://dlang.org/spec/function.html#pure-functions

 Make sense.. I have two follow up questions

 1. What about delegates ?
 2. If a function is not explicitly declared as pure but 
 satisfies the conditions of a pure function then can i check 
 whether the function is pure using functionAttributes in 
 std.traits.

1. they work the same. Delegates can have any of the function 
attributes that a function can, as well as scope, meaning the 
delegate will not be stored.

2. Yes and no. Template functions have their attributes inferred 
(but you can still annotate them manually, to make sure that the 
function is e.g. pure). Non-template functions don't have their 
attributes inferred.

Jacob Carlborg <doob me.com> writes:

On 2016-12-12 12:15, Nicholas Wilson wrote:

 there is the pure function attribute, how ever this still allows you to
 use globals *if you pass them as parameters to the function*.

And it can access immutable global data.

-- 
/Jacob Carlborg

Nikhil Jacob <nikhiljaco gmail.com> writes:

On Monday, 12 December 2016 at 12:30:42 UTC, Jacob Carlborg wrote:
 On 2016-12-12 12:15, Nicholas Wilson wrote:

 there is the pure function attribute, how ever this still 
 allows you to
 use globals *if you pass them as parameters to the function*.

 And it can access immutable global data.

Thank you all for the help