# computeMemoryClassContract

A compute memory class contract record carrying name, canHostAccess, canDeviceAccess, coherent, mappable, and related state.

Last updated: 2026-09-09

Package: compute.buffer | Status: source-declared

Tags: buffer, compute, compute.buffer, cpu, method, source-example, thing, yeho

Describe compute buffer layouts, ownership, transfers, and validation.

```yh
external thing computeMemoryClassContract
```

- text name: Stores name as text.
- bool canHostAccess: Stores can host access as bool.
- bool canDeviceAccess: Stores can device access as bool.
- bool coherent: Stores coherent as bool.
- bool mappable: Stores mappable as bool.
- bool externallyOwned: Stores externally owned as bool.
- bool currentFakeDeviceSupported: Stores current fake device supported as bool.
- text visibilityRule: Stores visibility rule as text.
- computeMemoryClassContract(text name, bool hostVisible, bool deviceVisible, bool coherent, bool mappable, bool externallyOwned, bool currentFakeDeviceSupported, text visibilityRule): Compute memory class contract.
- Describe() returns text: Describe.

## Use computeMemoryClassContract

A complete small caller. Values are illustrative; check the returned result and package requirements before connecting live resources.

Verification: type checked

```yh
using compute.buffer

// Describe compute buffer layouts, ownership, transfers, and validation.
computeMemoryClassContract sample = computeMemoryClassContract("Nova", true, true, true, true, true, true, "visibility Rule")
Console.Log(Text.From(sample.name))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.compute_buffer__computememoryclasscontract"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

[[dependencies]]
package = "compute.buffer"
version = "0.1.0"
path = "../../../yeho/packages/compute/buffer"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/compute.buffer--computeMemoryClassContract/usage --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


## computeMemoryClassContract.Describe

A complete caller for this public method. Sample inputs are illustrative; native resources require their owning lifecycle.

Verification: type checked

```yh
using compute.buffer

// Describe.
computeMemoryClassContract instance = computeMemoryClassContract("Nova", true, true, true, true, true, true, "visibility Rule")
text result = instance.Describe()
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.compute_buffer__computememoryclasscontract"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

[[dependencies]]
package = "compute.buffer"
version = "0.1.0"
path = "../../../yeho/packages/compute/buffer"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/compute.buffer--computeMemoryClassContract/method-Describe-9 --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


Package presence and a declaration do not establish support on every host. Host services need their platform and lifecycle setup.

Source: yeho/packages/compute/buffer/contracts.yh

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