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Allow DistanceFrom() to use user-defined abs() by default.

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`std::abs()` doesn't work on custom types. While one can use the 3-argument version of `DistanceFrom()` to specify how to compute the distance, it's not as convenient as defining `abs()` for the custom type once in the type's namespace and then use the 2-argument version.

PiperOrigin-RevId: 735741409
Change-Id: If8fb668455eb963a2ccf089f7467c64965a2e7a6
This commit is contained in:
Zhanyong Wan
2025-03-11 06:58:07 -07:00
committed by Copybara-Service
parent 0bdccf4aa2
commit 4ee4b17bf5
3 changed files with 42 additions and 3 deletions
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docs/reference/matchers.md
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@@ -42,7 +42,7 @@ Matcher | Description
| `Lt(value)` | `argument < value` |
| `Ne(value)` | `argument != value` |
| `IsFalse()` | `argument` evaluates to `false` in a Boolean context. |
| `DistanceFrom(target, m)` | The distance between `argument` and `target` (computed by `std::abs(argument - target)`) matches `m`. |
| `DistanceFrom(target, m)` | The distance between `argument` and `target` (computed by `abs(argument - target)`) matches `m`. |
| `DistanceFrom(target, get_distance, m)` | The distance between `argument` and `target` (computed by `get_distance(argument, target)`) matches `m`. |
| `IsTrue()` | `argument` evaluates to `true` in a Boolean context. |
| `IsNull()` | `argument` is a `NULL` pointer (raw or smart). |