Menu
The following code compiles in C#:
[ContentType("text")]
[ContentType("projection")]
public class Class1
{
}
The following code in F# does not compile:
[<ContentType("text")>]
[<ContentType("projection")>]
type Class1() = class end
The compile error in F# is: "The attribute type 'ContentTypeAttribute' has 'AllowMultiple=false'. Multiple instances of this attribute cannot be attached to a single language element."
By decompiling ContentType, I can see that ContentType inherits from MultipleBaseMetadataAttribute which has 'AllowMultiple=true' in the AttributeUsage.
In fact, it seems like F# does not inherit the AttributeUsage from the parent class.
[<AttributeUsage(AttributeTargets.Class, AllowMultiple = true)>]
type FooAttribute() =
inherit Attribute()
type BarAttribute() =
inherit FooAttribute()
[<Foo>]
[<Foo>]
type MyClassCompiles() = class end
where
[<Bar>]
[<Bar>]
type MyClassDoesNotCompile() = class end
725
Simply put, the Y=f(x) equation calculates the dependent output of a process given different inputs.
This formula, or new function, is called the derivative of the original function. When we find it we say that we are differentiating the function. The derivative of f(x) is written using an apostrophe after the f. The notation is f´(x) or y´ The notation dy/dx is also commonly used.
The first notation is to write f′(x) for the derivative of the function f(x). This functional notation was introduced by Lagrange, based on Isaac Newton's ideas. The dash in f′(x) denotes that f′(x) is derived from f(x).
The value of f(-1) is 1.
Looks like a bug. Email fsbugs[at]microsoft.com. Here's another apparent bug: it doesn't appear to honor AttributeTargets:
[<AttributeUsage(AttributeTargets.Enum)>]
type FooAttribute() =
inherit Attribute()
[<Foo>]
type T = struct end //happily compiles
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
