PHP Code:
(GetClientListeningFlags(iClient) & VOICE_MUTED)
Above is a bitfield, the resulting type after evaluation is int. When doing bit-wise AND, the resulting expression will either be equal to the VOICE_MUTED flag or it will be zero.
The "proper" way of evaluating the expression as a boolean one would be the following
PHP Code:
(GetClientListeningFlags(iClient) & VOICE_MUTED) == VOICE_MUTED
However, true-ness of an expression is only determined based off of whether or not the expression is zero. If the expression is equal to zero, then it is considered false, if it is non-zero, it is considered true.
When you do the following
PHP Code:
return !(GetClientListeningFlags(iClient) & VOICE_MUTED);
All you're doing is converting the expression to a bool, but you're negating the value. If you use the logical not operator (!) again, you negate it back.
All it is is a quick and dirty way to explicitly convert an integer expression to a boolean one.
If we do some pseudocode here
PHP Code:
int a = 54;
bool b = !a; // b stores false since a was "true"
b = !b; // negate again, now it stores true again, but we have a boolean. This matches the original "truth-ness" of a
// the equivalent to what is above is this
b = !!a;
// lets try with a false expression
int x = 0;
bool y = !x; // y contains true, since x is "false"
y = !y; // negate it again, y is false. This matches the original "truth-ness" of x
// the equivalent to what is above is this
y = !!x;
That's basically it, I hope what I explained was digestible. Feel free to jump in the discord, too, and some other people might be better at explaining it.
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