====== cpunum_set_irq_callback() ======
----
Install a driver callback for IRQ acknowledge. This callback is used to get a vector for an IRQ line.
===== Syntax =====
----
==== Declaration ====
Declared in ''src/emu/cpuint.h'' as

<code c++>void cpunum_set_irq_callback(int cpunum, int (*callback)(int irqline));</code>
==== Parameters ====
  * ''cpunum'' – Index to the CPU
  * ''*callback'' – Pointer to a function that will be called when this IRQ is fired.
==== Returns ====
Nothing.
===== Example =====
----
<code c++>static int irq_callback(int irq)
{
    return vectors[current_vector];
}

cpunum_set_irq_callback(0, irq_callback);</code>

Function ''irq_callback'' will be called when the first CPU acknowledges an interrupt. As vector the CPU will receive a value from the array ''vectors''.
===== See also =====
----
  * [[reference:cpunum_set_input_line|cpunum_set_input_line()]]
  * [[reference:cpunum_set_input_line_and_vector|cpunum_set_input_line_and_vector()]]
  * [[reference:cpunum_set_input_line_vector|cpunum_set_input_line_vector()]]