Because 'Return r' (when returning by value) always calls the copy-constructor, but it is implicit in this case (defined/added code by the compiler). See here with an explicit copy-constructor: Type rational numerator As Integer denominator As Integer Declare Constructor() Declare Constructo...

error 188: Missing UDT.constructor(byref as const UDT) implementation ( base UDT without default constructor requires manual initialization), found 'end' in 'end type' Define a 'constructor TAnimal ()' : constructor TAnimal () end constructor And also: constructor TMammel( l as strin...

Where is the body of the member procedure 'TAnimal.getName() as string'?

Just an important note about your code: - 'NEW' must be finished with a 'DELETE' . - 'NEW []' must be finished with a 'DELETE []' . So the correct code line is : 'DELETE [] p' . Fortunately, in the particular case of a data-type without destructor (explicit or...

I changed my version, but it still crashes on Windows. It seems I cannot use redim. https://freebasic.net/wiki/wikka.php?wakka=KeyPgredim says: "Using Redim within a member procedure with an array that contains the instance of the object class is undefined, and will [hopefully] result in horri...

As it should not be confused: print @cptr(UDT ptr, 0)->c 'with: print cptr(UDT ptr, 0)->c similarly, it should not be confused: Dim Byref As datatype ref = *Cptr(datatype Ptr, 0) 'with: Dim As datatype ref = *Cptr(datatype Ptr, 0) The first two expressions correspond to an internal pointer value ass...

The way the code is currently written MinusExists changes its value in the subroutine but never passes it back. I tried to do it by changing the "byval" to "byref" but get a type mismatch error . To answer your initial question, this above is the right solution, but you must do ...

I think that these FreeBasic additional syntaxes (compared to C for example): Dim Byref As datatype ref = *Cptr(datatype Ptr, 0) 'and @ref = @other_variable will be preserved in future revisions (and I agree with that), because as @dkl said similarly in a post in August 2016 (https://www.freebasic.n...

Thanks in advance.

But for that, a two-line workaround (see Using References , paragraph 'Hacking on usage of references with the additional syntaxes allowed by FreeBASIC' ): type T dValue as double End Type '' Instead of 'dim shared byref sp as T = *new T', a two-line workaround dim shared byref sp as T = *cptr(T ptr...

This problem is not exclusively due to the declaration of a reference, but more generally due to the initializer of the declaration 'Dim Shared' which must be a constant (or expression which can be evaluated at compile time, or global variable which can be evaluated at compilation). See the ...

Modifying or not a parameter inside a procedure does not modify the passing mode by default: ⋅ In '-lang fb dialect' , 'ByVal' is the default parameter passing convention for all built-in types except 'String' and 'User-Defined Type' which are passed 'By...

Inside your procedure 'ValidateLeadingSign()' , you want to modify in the global scope the values of the parameters 'Digit' , 'PlusExists' and 'MinusExists' . So these three must be passed by reference (pass only a copy is wrong). As by default a String is pas...

@badidea, I don't know if you automatically applied the golden rules or my maximizing rule, but for such a type, the copy-constructor and the copy-assignment (from a same type instance) should be optional because a shallow copy of the member data ( '.value' here) is sufficient. But if we del...

The declarations of parameter types and passing modes must be matching between procedure declaration line and procedure definition line. By default, a String is passed by reference while a Byte is passed by value. It is why the compiler only rizes an error on PlusExists and MinusExists : declare sub...