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Status](https://travis-ci.org/sdleffler/empty-option-rs.svg?branch=master)](https://travis-ci.org/sdleffler/empty-option-rs)\n[![Docs Status](https://docs.rs/empty-option/badge.svg)](https://docs.rs/empty-option)\n[![On crates.io](https://img.shields.io/crates/v/empty-option.svg)](https://crates.io/crates/empty-option)\n\n# empty-option: guards for safely taking and dealing with values from mutable references to `Option\u003cT\u003e`\n\nThis crate provides convenient wrappers for dealing with `\u0026mut Option\u003cT\u003e`. There are two main types, `OptionGuard` and `OptionGuardMut`:\n\n## `OptionGuard`\n\nUsing `EmptyOptionExt::steal` on an `\u0026mut Option\u003cT\u003e` produces the `T` from the option as well as an `OptionGuard`. If `OptionGuard::restore` is not called before the `OptionGuard` is dropped, then a panic will occur.\n\n### Examples\n\nCalling `guard.restore()` puts the stolen value back into the original option:\n\n```rust\nuse empty_option::EmptyOptionExt;\n\n// A mutable option, from which we shall steal a value!\nlet mut thing = Some(5);\n\n// Scope so that when we do `guard.restore()`, the mutable borrow on `thing` will end.\n{\n    // Steal the value - we now have the guard and also a concrete `T` from our `Option\u003cT\u003e`.\n    let (guard, five) = thing.steal();\n\n    assert_eq!(five, 5);\n\n    // Move the value back into `thing` - we're done.\n    guard.restore(6);\n}\n\n// The value is returned by `guard.restore()`.\nassert_eq!(thing, Some(6));\n```\n\nBut, if the guard is dropped instead, a runtime panic results.\n\n```rust,should_panic\nuse empty_option::EmptyOptionExt;\n\nlet mut thing = Some(5);\n\nlet (_, _) = thing.steal();\n\n// Never return the value!\n```\n\nCalling `.steal()` on a `None` immediately panics:\n\n```rust,should_panic\nlet mut thing = None;\n\n// Panics here!\nlet (guard, _) = thing.steal();\n\nguard.restore(5);\n```\n\n## `OptionGuardMut`\n\nUsing `EmptyOptionExt::steal_mut` on an `\u0026mut Option\u003cT\u003e` produces an `OptionGuardMut`, which dereferences to a `T`. To get the inner value out, `OptionGuardMut::into_inner` can be called. On `Drop`, if the `OptionGuardMut` is not consumed with `OptionGuardMut::into_inner`, the value in the `OptionGuardMut` will be returned to the `Option` that it was borrowed from.\n\n### Examples\n\nTake a value from an option, which is automatically returned:\n\n```rust\nuse empty_option::EmptyOptionExt;\n\nlet mut thing = Some(5);\n\n{\n    let mut stolen = thing.steal_mut();\n\n    assert_eq!(*stolen, 5);\n\n    *stolen = 6;\n}\n\nassert_eq!(thing, Some(6));\n```\n\nIf the guard is consumed, the value is never returned.\n\n```rust\nuse empty_option::EmptyOptionExt;\n\nlet mut thing = Some(5);\n\n{\n    // Keep the thing!\n    let stolen = thing.steal_mut().into_inner();\n\n    assert_eq!(stolen, 5);\n}\n\nassert_eq!(thing, None);\n```\n\nCalling `steal_mut` on a `None` immediately panics:\n\n```rust,should_panic\nlet mut thing: Option\u003ci32\u003e = None;\n\n// Panics here!\nthing.steal_mut();\n```\n\n## License\n\nLicensed under either of\n\n * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)\n * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)\n\nat your option.\n\n### Contribution\n\nUnless you explicitly state otherwise, any contribution intentionally\nsubmitted for inclusion in the work by you, as defined in the Apache-2.0\nlicense, shall be dual licensed as above, without any additional terms or\nconditions.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsdleffler%2Fempty-option-rs","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fsdleffler%2Fempty-option-rs","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsdleffler%2Fempty-option-rs/lists"}