Re: Implicit conversion of struct to bool for if (s) operation ?

[Mike Parker via Digitalmars-d-learn]

On Tuesday, 7 June 2016 at 22:28:57 UTC, Steven Schveighoffer 
wrote:

It's news to me that while opCast for all other types is for 
explicit
casting, opCast for bool works for implicit casting.

as ag0... mentioned in another thread, opCast is NOT implicitly 
being invoked here, but rather explicitly.

That is:

bool x = someStruct; // error
if(someStruct) // explicit opCast!bool


Documented under 'Boolean Operations' at 
http://dlang.org/spec/operatoroverloading.html#cast