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authorMilo Gilad <milogaccnts@gmail.com>2017-08-25 09:20:15 -0400
committerMilo Gilad <milogaccnts@gmail.com>2017-08-25 09:20:15 -0400
commit0510b181f0987b516402e63270b062bdecd360f2 (patch)
tree645ec0edf0b4f2aa170480f9b5dfbb835bb8090f /vala.html.markdown
parent2d70b5123f670d4e33d09e9b87b807788f69e0bb (diff)
Added section on functions
Diffstat (limited to 'vala.html.markdown')
-rwxr-xr-xvala.html.markdown51
1 files changed, 50 insertions, 1 deletions
diff --git a/vala.html.markdown b/vala.html.markdown
index 7cc59670..73ffa55c 100755
--- a/vala.html.markdown
+++ b/vala.html.markdown
@@ -149,7 +149,8 @@ class Message : GLib.Object { // Class Message extends GLib's Object
public string sender; // a public field
public string text {get; set;} // a public property
private bool sent = false; // private field
- public void send() { // public method
+ public void send(string message_sender) { // public method
+ sender = message_sender;
sent = true;
}
@@ -168,6 +169,54 @@ float dyna_casted_float = cast_to_float as float // Won't compile
var inferred_string = "hello"; // Type inference
+/* Methods (a.k.a. functions) */
+
+// Vala methods are C functions, and are bound by the same rules.
+
+int method_demo(string arg1, Object arg2) { // Returns int and takes args
+ return 1;
+}
+
+// Vala methods cannot be overloaded.
+
+void some_method(string text) { }
+void some_method(int number) { } // Won't compile
+
+// To achieve similar functionality, use default argument values.
+
+void some_better_method(string text, int number = 0) { }
+
+// varargs (variable-length argument lists) are also supported.
+
+void method_with_varargs(int arg1, ...) {
+ var varargs_list = va_list(); // gets the varargs list
+ string arg_string = varargs_list.arg(); // gets arguments, one after another
+ int int_vararg = varargs_list.arg();
+ stdout.printf("%s, %d\n", arg_string, int_vararg)
+}
+
+string? ok_to_be_null(int? test_int) { } // "?" denotes possible null value
+
+// Delegates
+
+delegate void DelegateDemo(char char_a);
+
+void delegate_match(char char_a) { // Matches the delegate's signature
+ stdout.printf("%d\n");
+}
+
+void call_delegate(DelegateDemo d, char char_b) { // Takes a delegate arg
+ d(char_b) // calls delegate
+}
+
+void final_delegate_demo() {
+ call_delegate(delegate_match); // Passes matching method as argument
+}
+
+// Lambdas/Anonymous Methods are defined with "=>"
+
+(a) => { stdout.printf("%d\n", a); } // Prints "a"
+
struct Closet {
public uint shirts;
public uint jackets;