Defer 1.0.0

Defer

This repository provides IDeferable to emulate Golang's defer keyword in C#.

Installing

The package is available on NuGet. To install, run:

dotnet add package Defer

Build Status

Using Deferable

Usage of Deferable

// Deferable.Defer
Console.WriteLine("Hello, World!");
using (Deferable.Defer(() => Console.WriteLine("Goodbye, World!")))
{
    Console.WriteLine("Do something");
}

// output:
// Hello, World!
// Do something
// Goodbye, World!

Usage of Deferable<T>

// Deferable<T>
int status = -1;

Console.WriteLine("init status: " + status);
using (Deferable<int>.Defer(value => status = value, initValue: 1, deferValue: 0))
{
    Console.WriteLine("doing something status: " + status);
}
Console.WriteLine("after defer status: " + status);

// output:
// init status: -1
// doing something status: 1
// after defer status: 0

Usage of BooleanDeferable

// BooleanDeferable
bool flag = default;

Console.WriteLine("init flag: " + flag);
using (BooleanDeferable.Defer(value => flag = value))
{
    Console.WriteLine("doing something flag: " + flag);
}
Console.WriteLine("after defer flag: " + flag);

// output:
// init flag: False
// doing something flag: True
// after defer flag: False

Usage of RefDeferable<T>

// RefDeferable<T>
// Only applicable for .NET Standard 2.1, .NET Core 3.0, or later versions
double value = -1d;

Console.WriteLine("init value: " + value);
using (RefDeferable<double>.Defer(ref value, 0d, 1d))
{
    Console.WriteLine("doing something value: " + value);
}
Console.WriteLine("after defer value: " + value);

// output:
// init value: -1
// doing something value: 0
// after defer value: 1

References

https://blog.coldwind.top/posts/mimic-go-defer-in-csharp/