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author | Inna Palant <ipalant@google.com> | 2023-12-13 13:42:12 +0000 |
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committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | 2023-12-13 13:42:12 +0000 |
commit | e3add1d9cc9a13d487ce63bca96cf9bc426add6d (patch) | |
tree | 1d048800858fbab4133f7293e262528b225b5bb4 /src/core.rs | |
parent | 5ca6d8052723b3c36f0c1f5aa60514b1448e9e89 (diff) | |
parent | 33f8c696864e31927c5a4db0476deba652cd53b3 (diff) | |
download | predicates-core-e3add1d9cc9a13d487ce63bca96cf9bc426add6d.tar.gz |
Merge remote-tracking branch 'origin/upstream' am: fbd6d83767 am: e2aa229766 am: 33f8c69686android-14.0.0_r51android-14.0.0_r50android-14.0.0_r37android-14.0.0_r36android-14.0.0_r35android-14.0.0_r34android-14.0.0_r33android-14.0.0_r32android-14.0.0_r31android-14.0.0_r30android-14.0.0_r29android-14.0.0_r28android14-qpr3-releaseandroid14-qpr2-s5-releaseandroid14-qpr2-s4-releaseandroid14-qpr2-s3-releaseandroid14-qpr2-s2-releaseandroid14-qpr2-s1-releaseandroid14-qpr2-release
Original change: undetermined
Change-Id: Ieaf1f2013ae6663eb57747f0ecbca44b54faaa88
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
Diffstat (limited to 'src/core.rs')
-rw-r--r-- | src/core.rs | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/core.rs b/src/core.rs new file mode 100644 index 0000000..b5aaa7b --- /dev/null +++ b/src/core.rs @@ -0,0 +1,32 @@ +// Copyright (c) 2018 The predicates-rs Project Developers. +// +// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or +// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license +// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your +// option. This file may not be copied, modified, or distributed +// except according to those terms. + +use crate::reflection; + +/// Trait for generically evaluating a type against a dynamically created +/// predicate function. +/// +/// The exact meaning of `eval` depends on the situation, but will usually +/// mean that the evaluated item is in some sort of pre-defined set. This is +/// different from `Ord` and `Eq` in that an `item` will almost never be the +/// same type as the implementing `Predicate` type. +pub trait Predicate<Item: ?Sized>: reflection::PredicateReflection { + /// Execute this `Predicate` against `variable`, returning the resulting + /// boolean. + fn eval(&self, variable: &Item) -> bool; + + /// Find a case that proves this predicate as `expected` when run against `variable`. + fn find_case<'a>(&'a self, expected: bool, variable: &Item) -> Option<reflection::Case<'a>> { + let actual = self.eval(variable); + if expected == actual { + Some(reflection::Case::new(None, actual)) + } else { + None + } + } +} |