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# XCTMemoryMetric

A metric to record the physical memory that a performance test uses.

```
class XCTMemoryMetric
```

## Overview

`XCTMemoryMetric` compares the memory use before and after running the block argument to [`measure(metrics:block:)`](/documentation/XCTest/XCTestCase/measure(metrics:block:)), and reports the difference.

## Topics

### Initializers

[`-  init`](/documentation/XCTest/XCTMemoryMetric/init())

Initializes a metric that measures memory use in the current process.

[`-  initWithApplication:`](/documentation/XCTest/XCTMemoryMetric/init(application:))

Initializes a metric that measures memory use in the target app.

## Relationships

### Conforms To

[`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible)

[`Hashable`](/documentation/Swift/Hashable)

[`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol)

[`Equatable`](/documentation/Swift/Equatable)

[`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible)

[`CVarArg`](/documentation/Swift/CVarArg)

[`NSCopying`](/documentation/Foundation/NSCopying)

[`XCTMetric`](/documentation/XCTest/XCTMetric)

### Inherits From

[`NSObject-swift.class`](/documentation/ObjectiveC/NSObject-swift.class)

---

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