diff options
Diffstat (limited to 'doc/classes/Variant.xml')
| -rw-r--r-- | doc/classes/Variant.xml | 33 |
1 files changed, 22 insertions, 11 deletions
diff --git a/doc/classes/Variant.xml b/doc/classes/Variant.xml index 5416468ab6..b1ce05888a 100644 --- a/doc/classes/Variant.xml +++ b/doc/classes/Variant.xml @@ -14,16 +14,21 @@ # bar = "Uh oh! I can't make static variables become a different type!" [/gdscript] [csharp] - // ... but C# is statically typed. Once a variable has a type it cannot be changed. However you can use the var keyword in methods to let the compiler decide the type automatically. - var foo = 2; // Foo is a 32-bit integer (int). Be cautious, integers in GDScript are 64-bit and the direct C# equivalent is "long". + // C# is statically typed. Once a variable has a type it cannot be changed. You can use the `var` keyword to let the compiler infer the type automatically. + var foo = 2; // Foo is a 32-bit integer (int). Be cautious, integers in GDScript are 64-bit and the direct C# equivalent is `long`. // foo = "foo was and will always be an integer. It cannot be turned into a string!"; var boo = "Boo is a string!"; - var ref = new Reference(); // var is especially useful when used together with a constructor. + var ref = new RefCounted(); // var is especially useful when used together with a constructor. + + // Godot also provides a Variant type that works like an union of all the Variant-compatible types. + Variant fooVar = 2; // fooVar is dynamically an integer (stored as a `long` in the Variant type). + fooVar = "Now fooVar is a string!"; + fooVar = new RefCounted(); // fooVar is a GodotObject. [/csharp] [/codeblocks] Godot tracks all scripting API variables within Variants. Without even realizing it, you use Variants all the time. When a particular language enforces its own rules for keeping data typed, then that language is applying its own custom logic over the base Variant scripting API. - GDScript automatically wrap values in them. It keeps all data in plain Variants by default and then optionally enforces custom static typing rules on variable types. - - C# is statically typed, but uses the Mono [code]object[/code] type in place of Godot's Variant class when it needs to represent a dynamic value. [code]object[/code] is the Mono runtime's equivalent of the same concept. + - C# is statically typed, but uses its own implementation of the [code]Variant[/code] type in place of Godot's Variant class when it needs to represent a dynamic value. A [code]Variant[/code] can be assigned any compatible type implicitly but converting requires an explicit cast. The global [method @GlobalScope.typeof] function returns the enumerated value of the Variant type stored in the current variable (see [enum Variant.Type]). [codeblocks] [gdscript] @@ -42,14 +47,20 @@ # Open your project.godot file to see it up close. [/gdscript] [csharp] - int foo = 2; - if (foo == null) + Variant foo = 2; + switch (foo.VariantType) { - GD.Print("foo is null"); - } - if (foo is int) - { - GD.Print("foo is an integer"); + case Variant.Type.Nil: + GD.Print("foo is null"); + break; + case Variant.Type.Int: + GD.Print("foo is an integer"); + break; + case Variant.Type.Object: + // Note that Objects are their own special category. + // You can convert a Variant to a GodotObject and use reflection to get its name. + GD.Print($"foo is a(n) {foo.AsGodotObject().GetType().Name}"); + break; } [/csharp] [/codeblocks] |