From f0fb536516e4799a76c7a02930555cdd14c70cd3 Mon Sep 17 00:00:00 2001
From: Michael Bull <mikebull94@gmail.com>
Date: Sun, 22 Oct 2017 15:08:23 +0100
Subject: [PATCH] Add Result.of factory method

Inspired by result4k, invokes a callback within a try/catch block,
returning an Error if an exception was thrown and Ok otherwise.
---
 .../com/github/michaelbull/result/Result.kt     | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/main/kotlin/com/github/michaelbull/result/Result.kt b/src/main/kotlin/com/github/michaelbull/result/Result.kt
index f5bd24e..9f3b1f9 100644
--- a/src/main/kotlin/com/github/michaelbull/result/Result.kt
+++ b/src/main/kotlin/com/github/michaelbull/result/Result.kt
@@ -7,7 +7,22 @@ package com.github.michaelbull.result
  * - Haskell: [Data.Either](https://hackage.haskell.org/package/base-4.10.0.0/docs/Data-Either.html)
  * - Rust: [Result](https://doc.rust-lang.org/std/result/enum.Result.html)
  */
-sealed class Result<out V, out E>
+sealed class Result<out V, out E> {
+    companion object {
+
+        /**
+         * Invokes a [function] and wraps it in a [Result], returning an [Error] if a [Throwable]
+         * was thrown, otherwise [Ok].
+         */
+        inline fun <T> of(function: () -> T): Result<T, Throwable> {
+            return try {
+                Ok(function.invoke())
+            } catch (t: Throwable) {
+                Error(t)
+            }
+        }
+    }
+}
 
 data class Ok<out V> constructor(val value: V) : Result<V, Nothing>()
 data class Error<out E> constructor(val error: E) : Result<Nothing, E>()