Re: any way to prevent overriding of .init ?
I'm having the same issue with a COM interface that happens to define an init method. I've used a COM object inside a struct and used the 'alias this' trick to forward all calls, but for init I had to create a special 'initialize' method in the struct that would call the COM object's init method explicitly.
Re: any way to prevent overriding of .init ?
On 2011-06-13 12:50, Dmitry Olshansky wrote: Right now there are lot of Phobos functionality that fully expects A.init to return just that - a default initialized value of type A. Now consider: struct A { int i; void init(int K) { //blah } } Then: map!a.i([A(1), A(2), A(3)]); for me explodes with : std\algorithm.d(382): Error: function test.A.init (int K) is not callable using argument types () std\algorithm.d(382): Error: expected 1 function arguments, not 0 due to this line in std.algorithm: alias typeof(_fun(.ElementType!R.init)) ElementType; Any way to circumvent this name lookup oddity and get to built-in property? If there is, shouldn't we use it throughout Phobos? The issue is not a theoretical one - it severely limits usability of my pull request (not posted because of this) that makes dirEntries return proper InputRange of DirEntry . Namely, DirEntry happen to define just such a function (init). If init is causing a problem, get rid of it. It's scheduled for deprecation anyway, and it arguably never should have been called by anyone other than std.file in the first place. - Jonathan M Davis
Re: any way to prevent overriding of .init ?
On 14.06.2011 0:03, Jonathan M Davis wrote: On 2011-06-13 12:50, Dmitry Olshansky wrote: Right now there are lot of Phobos functionality that fully expects A.init to return just that - a default initialized value of type A. Now consider: struct A { int i; void init(int K) { //blah } } Then: map!a.i([A(1), A(2), A(3)]); for me explodes with : std\algorithm.d(382): Error: function test.A.init (int K) is not callable using argument types () std\algorithm.d(382): Error: expected 1 function arguments, not 0 due to this line in std.algorithm: alias typeof(_fun(.ElementType!R.init)) ElementType; Any way to circumvent this name lookup oddity and get to built-in property? If there is, shouldn't we use it throughout Phobos? The issue is not a theoretical one - it severely limits usability of my pull request (not posted because of this) that makes dirEntries return proper InputRange of DirEntry . Namely, DirEntry happen to define just such a function (init). If init is causing a problem, get rid of it. It's scheduled for deprecation anyway, and it arguably never should have been called by anyone other than std.file in the first place. Well, I that what I'm was thinking to do as 'right here, right now' solution. Now taking into account that it wasn't documented before I'll just kill it. Still, the general issue remains. -- Dmitry Olshansky
Re: any way to prevent overriding of .init ?
On 2011-06-13 13:06, Dmitry Olshansky wrote: On 14.06.2011 0:03, Jonathan M Davis wrote: On 2011-06-13 12:50, Dmitry Olshansky wrote: Right now there are lot of Phobos functionality that fully expects A.init to return just that - a default initialized value of type A. Now consider: struct A { int i; void init(int K) { //blah } } Then: map!a.i([A(1), A(2), A(3)]); for me explodes with : std\algorithm.d(382): Error: function test.A.init (int K) is not callable using argument types () std\algorithm.d(382): Error: expected 1 function arguments, not 0 due to this line in std.algorithm: alias typeof(_fun(.ElementType!R.init)) ElementType; Any way to circumvent this name lookup oddity and get to built-in property? If there is, shouldn't we use it throughout Phobos? The issue is not a theoretical one - it severely limits usability of my pull request (not posted because of this) that makes dirEntries return proper InputRange of DirEntry . Namely, DirEntry happen to define just such a function (init). If init is causing a problem, get rid of it. It's scheduled for deprecation anyway, and it arguably never should have been called by anyone other than std.file in the first place. Well, I that what I'm was thinking to do as 'right here, right now' solution. Now taking into account that it wasn't documented before I'll just kill it. Still, the general issue remains. True. And I would argue that it should probably be illegal to declare a function with the name init which is not a free function. Maybe that would be unacceptable for some reason, but it seems to me that it would solve the problem quite cleanly. - Jonathan M Davis