• W.Boeke (15/15) Nov 09 2019 I am trying to catch a signal from the OS, as follows:
• Dennis (5/7) Nov 09 2019 In C you can omit the & when taking a function address, but when
• W.Boeke (9/14) Nov 09 2019 Bingo! That worked. The modified code is:

W.Boeke <w.boeke upcmail.nl> writes:

I am trying to catch a signal from the OS, as follows:

int winch;

void set_winch (int sig) {
   enum SIGWINCH = 28;
   signal.signal(SIGWINCH,cast(void function(int))set_winch);
   winch = sig;
}

The SIGWINCH signal notifies a window resize. In C this works 
(without the cast), but in D I get a compilation error:

Error: function signal.set_winch(int sig) is not callable using 
argument types ()


What should be the right way to accomplish this?
Thanks in advance for your answer.

Wouter

Dennis <dkorpel gmail.com> writes:

On Saturday, 9 November 2019 at 12:44:20 UTC, W.Boeke wrote:
 What should be the right way to accomplish this?

Put an ampersand before the function to get its address:
   signal.signal(SIGWINCH,cast(void function(int)) &set_winch);

In C you can omit the & when taking a function address, but when 
you do that in D it tries to call the function and cast the 
return value of the function instead.

W.Boeke <w.boeke upcmail.nl> writes:

On Saturday, 9 November 2019 at 12:56:52 UTC, Dennis wrote:
 Put an ampersand before the function to get its address:
   signal.signal(SIGWINCH,cast(void function(int)) &set_winch);

 In C you can omit the & when taking a function address, but 
 when you do that in D it tries to call the function and cast 
 the return value of the function instead.

Bingo! That worked. The modified code is:

int winch;
extern(C) void set_winch(int sig) nothrow  nogc  system {
   enum SIGWINCH = 28;
   signal.signal(SIGWINCH,&set_winch);
   winch = sig;
}

Wouter