opEquals nothrow

[w0rp via Digitalmars-d-learn]

On Thursday, 20 July 2017 at 15:10:24 UTC, Aldo wrote:
> On Thursday, 20 July 2017 at 14:59:50 UTC, Steven Schveighoffer 
> wrote:
>> On 7/20/17 10:38 AM, Aldo wrote:
>>> Hello,
>>> 
>>> im tring to add nothrow keyword in my code, but compilation 
>>> fails :
>>> 
>>> function 'object.opEquals' is not nothrow
>>> 
>>> 
>>> its a simple comparison between 2 objects. How to make 
>>> opEquals nothrow ?
>>
>> You can't. Object.opEquals is not nothrow, so object.opEquals 
>> is not nothrow (note the former is the virtual member 
>> function, the latter is a global function which is what the 
>> compiler actually calls).
>>
>> It is a legacy limitation. Until we get rid of all the Object 
>> base methods for things like opEquals and toHash, we will not 
>> be able to fix this.
>>
>> -Steve
>
> Im using DerelictGLFW3, to process events im doing this :
>
> glfwSetMouseButtonCallback(window, &onMouseClick);
>
> onMouseClick function must be nothrow.
>
> But now I can't do anything in this function because I can't 
> convert my code to nothrow.
>
> Can I put a try catch in the body ?
>
> extern(C) nothrow
> {
>     void onMouseClick(GLFWwindow* window, int button, int 
> action, int d)
>     {
>        try
>        {
>            // my code
>        }
>        catch
>        {
>
>        }
>     }
> }
>
> it seems its working but what about performances ?
>
> thanks

You could also try assumeWontThrow. 
https://dlang.org/library/std/exception/assume_wont_throw.html