How can i call @system function in a @safe function?

On 07/12/2016 11:09 AM, Dsby wrote:
> How can i call @system function in a @safe function?

You can't. You can mark the @safe function @trusted [1] instead. @trusted functions are considered memory-safe by the compiler and can be called from @safe code, but they can use @system features and call @system functions.

A @trusted function must still be memory-safe, and the compiler cannot check that it is, so you as the programmer take on the responsibility to ensure that the function is in fact memory-safe.

Be very careful with @trusted and make sure you know exactly what you're doing. A bad @trusted function compromises the whole call chain.


[1] https://dlang.org/spec/function.html#trusted-functions

On Tuesday, 12 July 2016 at 09:17:37 UTC, ag0aep6g wrote:
> On 07/12/2016 11:09 AM, Dsby wrote:
>> How can i call @system function in a @safe function?
>
> You can't. You can mark the @safe function @trusted [1] instead. @trusted functions are considered memory-safe by the compiler and can be called from @safe code, but they can use @system features and call @system functions.
>
> A @trusted function must still be memory-safe, and the compiler cannot check that it is, so you as the programmer take on the responsibility to ensure that the function is in fact memory-safe.
>
> Be very careful with @trusted and make sure you know exactly what you're doing. A bad @trusted function compromises the whole call chain.
>
>
> [1] https://dlang.org/spec/function.html#trusted-functions

Thanks!