@stdlib/strided/base/mskunary-signature-callbacks/README.md

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# Callbacks

> Assign callbacks to masked unary interfaces according to type [promotion rules][@stdlib/ndarray/promotion-rules].

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## Usage

```javascript
var callbacks = require( '@stdlib/strided/base/mskunary-signature-callbacks' );
```

#### callbacks( table, signatures )

Assigns callbacks to masked unary interfaces according to type [promotion rules][@stdlib/ndarray/promotion-rules].

```javascript
var signatures = require( '@stdlib/strided/base/mskunary-dtype-signatures' );
var identity = require( '@stdlib/math/base/special/identity' );
var cidentity = require( '@stdlib/math/base/special/cidentity' );
var cidentityf = require( '@stdlib/math/base/special/cidentityf' );

var dtypes = [
    'float64',
    'float32',
    'int32',
    'uint8'
];

var sigs = signatures( dtypes, dtypes );
// returns [...]

var table = {
    'default': identity,
    'complex64': cidentityf,
    'complex128': cidentity
};

var list = callbacks( table, sigs );
// returns [...]
```

The function accepts the following arguments:

-   **table**: callback table.
-   **signatures**: strided array containing masked unary interface signatures.

A callback `table` should have the following properties:

-   **default**: default callback.
-   **complex64**: callback for single-precision complex floating-point numbers.
-   **complex128**: callback for double-precision complex floating-point numbers.

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## Notes

-   The function assumes that the provided signature array has the following properties:

    -   a strided array having a stride length of `3` (i.e., every `3` elements define a masked unary interface signature).
    -   for each signature (i.e., set of two consecutive non-overlapping strided array elements), the first element is the input data type, the second element is the mask data type, and the third element is the return data type.
    -   all signatures (excluding the mask data type) follow type [promotion rules][@stdlib/ndarray/promotion-rules].

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## Examples

<!-- eslint no-undef: "error" -->

```javascript
var dtypes = require( '@stdlib/strided/dtypes' );
var signatures = require( '@stdlib/strided/base/mskunary-dtype-signatures' );
var identity = require( '@stdlib/math/base/special/identity' );
var cidentity = require( '@stdlib/math/base/special/cidentity' );
var cidentityf = require( '@stdlib/math/base/special/cidentityf' );
var callbacks = require( '@stdlib/strided/base/mskunary-signature-callbacks' );

// Get the list of supported strided array data types:
var dt = dtypes();

// Generate masked unary interface signatures:
var sigs = signatures( dt, dt );

// Define a callback table:
var table = {
    'default': identity,
    'complex64': cidentityf,
    'complex128': cidentity
};

// Generate a list of callbacks according to type promotion rules:
var clbks = callbacks( table, sigs );
// returns [...]
```

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* * *

## See Also

-   <span class="package-name">[`@stdlib/strided/base/mskunary-dtype-signatures`][@stdlib/strided/base/mskunary-dtype-signatures]</span><span class="delimiter">: </span><span class="description">generate a list of masked unary interface signatures from strided array data types.</span>

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[@stdlib/ndarray/promotion-rules]: https://www.npmjs.com/package/@stdlib/ndarray-promotion-rules

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[@stdlib/strided/base/mskunary-dtype-signatures]: https://github.com/stdlib-js/strided/tree/main/base/mskunary-dtype-signatures

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