Re: [Vala] [ANNOUNCE] Vala 0.7.6 - Compiler for the GObject type system
On Fri, 2009-09-18 at 10:11 +0200, Frederik wrote:
Great release!
Thanks.
One question about closures: is it intentional that captured variables
change after the closure? For example:
--
delegate void Func ();
void main () {
int a = 42;
Func f = () = stdout.printf (%d\n, a);
a = 43;
f ();
}
--
Output: 43
This is correct, there is only one instance of the variable `a' and that
instance is captured by the closure. You can also change the value of
`a' inside the closure and this will affect the outer method as well as
there is only one instance of this variable.
This seems to affect currying as well:
--
delegate int IntFuncInt (int i);
IntFuncInt curried_add (int a) {
return b = a + b;
}
void main () {
int a = 3;
int b = 4;
stdout.printf (%d + %d = %d\n, a, b, curried_add (a)(b));
}
--
Output: 3 + 4 = 4
This was a bug in how delegates were returned from methods. This is now
fixed in master.
Jürg
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Re: [Vala] [ANNOUNCE] Vala 0.7.6 - Compiler for the GObject type system
Hi,
Thanks for the great release! Great progress!!
Then the bad news ;-) The output of this one is 0. Is this correct?
JP
---
delegate void Func ();
Func goo () {
int a = 42;
Func f = () = stdout.printf (%d\n, a);
a = 43;
return f;
}
void main () {
var f = goo ();
f ();
}
---
On Fri, 2009-09-18 at 10:11 +0200, Frederik wrote:
Great release!
Thanks.
One question about closures: is it intentional that captured variables
change after the closure? For example:
--
delegate void Func ();
void main () {
int a = 42;
Func f = () = stdout.printf (%d\n, a);
a = 43;
f ();
}
--
Output: 43
This is correct, there is only one instance of the variable `a' and that
instance is captured by the closure. You can also change the value of
`a' inside the closure and this will affect the outer method as well as
there is only one instance of this variable.
This seems to affect currying as well:
--
delegate int IntFuncInt (int i);
IntFuncInt curried_add (int a) {
return b = a + b;
}
void main () {
int a = 3;
int b = 4;
stdout.printf (%d + %d = %d\n, a, b, curried_add (a)(b));
}
--
Output: 3 + 4 = 4
This was a bug in how delegates were returned from methods. This is now
fixed in master.
Jürg
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Re: [Vala] [ANNOUNCE] Vala 0.7.6 - Compiler for the GObject type system
Jürg Billeter wrote: This is correct, there is only one instance of the variable `a' and that instance is captured by the closure. You can also change the value of `a' inside the closure and this will affect the outer method as well as there is only one instance of this variable. You're right, I have tried it now with C# and it's the same behaviour. This was a bug in how delegates were returned from methods. This is now fixed in master. Thanks! Best regards, Frederik ___ Vala-list mailing list Vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list
Re: [Vala] [ANNOUNCE] Vala 0.7.6 - Compiler for the GObject type system
jp0...@jippii.fi wrote: Hi, Thanks for the great release! Great progress!! Then the bad news ;-) The output of this one is 0. Is this correct? Seems to work now with Vala/master. Maybe it was the same bug as with my second example. Best regards, Frederik ___ Vala-list mailing list Vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list
Re: [Vala] [ANNOUNCE] Vala 0.7.6 - Compiler for the GObject type system
Already fixed? Great! Thanks! JP jp0...@jippii.fi wrote: Hi, Thanks for the great release! Great progress!! Then the bad news ;-) The output of this one is 0. Is this correct? Seems to work now with Vala/master. Maybe it was the same bug as with my second example. Best regards, Frederik ___ Vala-list mailing list Vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list -- __ Saunalahdelta mullistava uutuus Nokia N97 ja kaiken kattava TotaaliMAX nyt ennakkomyynnissä uskomattoman edullisesti! Paketissa puhelut ja viestit (3000 min/kpl/kk), huippunopea mobiililaajakaista sekä Nokia N97 yhdellä kk-maksulla vain 59,95 e/kk (24 kk sopimus). Katso http://saunalahti.fi/totaalimax ___ Vala-list mailing list Vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list
[Vala] [ANNOUNCE] Vala 0.7.6 - Compiler for the GObject type system
We are pleased to announce version 0.7.6 of Vala, a compiler for the GObject type system. Vala 0.7.6 is now available for download at: http://download.gnome.org/sources/vala/0.7/ Changes since 0.7.5 * Add support for closures. * Improve support for asynchronous methods. * Support async methods in D-Bus servers. * Add clutter-1.0 bindings (Rob Taylor). * Add GVariant, GSettings, and dconf bindings (Ryan Lortie). * Add linux, libnl-1, and libasound bindings (Michael 'Mickey' Lauer). * Add gnutls bindings (Jiří Zárevúcky). * Add librest bindings (Adrien Bustany). * Many bug fixes and binding updates. Vala is a new programming language that aims to bring modern programming language features to GNOME developers without imposing any additional runtime requirements and without using a different ABI compared to applications and libraries written in C. valac, the Vala compiler, is a self-hosting compiler that translates Vala source code into C source and header files. It uses the GObject type system to create classes and interfaces declared in the Vala source code. The syntax of Vala is similar to C#, modified to better fit the GObject type system. Vala supports modern language features as the following: * Interfaces * Properties * Signals * Foreach * Lambda expressions * Type inference for local variables * Generics * Non-null types * Assisted memory management * Exception handling Vala is designed to allow access to existing C libraries, especially GObject-based libraries, without the need for runtime bindings. All that is needed to use a library with Vala is an API file, containing the class and method declarations in Vala syntax. Vala currently comes with bindings for GLib and GTK+. It's planned to provide generated bindings for the full GNOME Platform at a later stage. Using classes and methods written in Vala from an application written in C is not difficult. The Vala library only has to install the generated header files and C applications may then access the GObject-based API of the Vala library as usual. It should also be easily possible to write a bindings generator for access to Vala libraries from applications written in e.g. C# as the Vala parser is written as a library, so that all compile-time information is available when generating a binding. More information about Vala is available at http://live.gnome.org/Vala Jürg Billeter ___ Vala-list mailing list Vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list
