# QuickCast to Delegates

> [`Tango.Functional.QuickDelegateCast`](https://github.com/gabrielschade/Tango/blob/master/Tango/Tango/Functional/QuickDelegateCast.cs)

this *static* class contains methods to transform a named method to its respectively delegate `Func` or `Action`.

It turns way more easily to uses the extensions to [`Curry`](https://github.com/gabrielschade/tango/tree/379cc4a38ae47796971eb875ec66e7dc053a9081/Functional/Currying.html) and [`Partial Application`](https://github.com/gabrielschade/tango/tree/379cc4a38ae47796971eb875ec66e7dc053a9081/Functional/PartialApplication.html).

## Methods

| Name | Parameters                         | Returns                   | Description                    |
| ---- | ---------------------------------- | ------------------------- | ------------------------------ |
| F    | Func\<TResult> function            | Func\<TResult>            | Casts a function as a delegate |
| F    | Func\<T, TResult> function         | Func\<T, TResult>         | Casts a function as a delegate |
| F    | Func\<T, T2, TResult> function     | Func\<T, T2, TResult>     | Casts a function as a delegate |
| F    | Func\<T, T2, T3, TResult> function | Func\<T, T2, T3, TResult> | Casts a function as a delegate |
| F    | Func\<T, T2, TResult> function     | Func\<T, T2, TResult>     | Casts a function as a delegate |
| A    | Action function                    | Action                    | Casts a function as a delegate |
| A    | Action\<T> function                | Action\<T>                | Casts a function as a delegate |
| A    | Action\<T, T2> function            | Action\<T, T2>            | Casts a function as a delegate |
| A    | Action\<T, T2, T3> function        | Action\<T, T2, T3>        | Casts a function as a delegate |
| A    | Action\<T, T2, T3, T4> function    | Action\<T, T2, T3, T4>    | Casts a function as a delegate |

## Usage

The several overloads avaliable in this class can be used to cast a named function into its respectively delegate.

Unfortunately, because of the language limitations is not possible (until now) treat an named function directly as an delegate.

See the code bellow:

```csharp
int SampleAdd(int value1, int value2)
    => value1 + value2;

SampleAdd.Curry();
SampleAdd.PartialApply(1);
```

The attemp to uses `Curry` and `PartialApply` will causes an compile error, because SampleAdd isa method and can't be used in this specific context.

To uses these extensions is necessary to cast the named function into a delegate.

```csharp
Func<int, int, int> sampleAddAsDelegate = SampleAdd;

sampleAddAsDelegate.Curry();
sampleAddAsDelegate.PartialApply(1);
```

With this class, is possible to create a more quick version of this cast.

To do this inline cast, you need to follow the steps bellow:

1. Add a command of `using static Tango.Functional.QuickDelegateCast`;
2. Uses the correct overload described in `Methods` subsection.

```csharp
using static Tango.Functional.QuickDelegateCast;

int SampleAdd(int value1, int value2)
    => value1 + value2;

F<int, int, int>(SampleAdd).Curry();
F<int, int, int>(SampleAdd).PartialApply(1);
```

Through the `F()` and `A()` sintax is possible to cast a named function to its respectively delegate and use its extensions.

The fundamentals about Currying and Partial Application can be find in [Fundamentals > Currying and Partial Application](https://github.com/gabrielschade/tango/tree/379cc4a38ae47796971eb875ec66e7dc053a9081/Concepts/Currying%20and%20Partial%20Application.html).


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