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

2016-06-07 Thread 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

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

2016-06-07 Thread Steven Schveighoffer via Digitalmars-d-learn
On 6/7/16 6:15 PM, Ali Çehreli wrote: On 06/06/2016 08:28 AM, Adam D. Ruppe wrote: On Monday, 6 June 2016 at 15:23:50 UTC, chmike wrote: I would like an implicit conversion of Info to bool that return false if category_ is null so that I can write add: bool opCast(T : bool)() { return

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

2016-06-07 Thread Ali Çehreli via Digitalmars-d-learn
On 06/06/2016 08:28 AM, Adam D. Ruppe wrote: On Monday, 6 June 2016 at 15:23:50 UTC, chmike wrote: I would like an implicit conversion of Info to bool that return false if category_ is null so that I can write add: bool opCast(T : bool)() { return whatever; } to the struct and it should

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

2016-06-07 Thread Basile B. via Digitalmars-d-learn
On Monday, 6 June 2016 at 15:34:18 UTC, chmike wrote: On Monday, 6 June 2016 at 15:28:35 UTC, John wrote: Thank you John and Adam. That was a quick answer ! Too late but another option would have been to put an alias this on a bool getter: struct Info { bool getStuff() {

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

2016-06-06 Thread chmike via Digitalmars-d-learn
On Monday, 6 June 2016 at 15:28:35 UTC, John wrote: Thank you John and Adam. That was a quick answer !

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

2016-06-06 Thread Adam D. Ruppe via Digitalmars-d-learn
On Monday, 6 June 2016 at 15:23:50 UTC, chmike wrote: I would like an implicit conversion of Info to bool that return false if category_ is null so that I can write add: bool opCast(T : bool)() { return whatever; } to the struct and it should work.

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

2016-06-06 Thread John via Digitalmars-d-learn
On Monday, 6 June 2016 at 15:23:50 UTC, chmike wrote: Hello, I have a structure with two fields ad defined as struct Info { this(int value, Category category) { category_ = category; value_ = category ? value : 0; } // This converts implicitly to bool.