time-to-botec

README.md (5835B)

---

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 # smskmap
 
 > C API for registering a Node-API module exporting a strided array interface for applying a unary callback accepting and returning single-precision floating-point numbers to each element in a single-precision floating-point strided input array according to a corresponding element in a strided mask array and assigning results to elements in a single-precision floating-point strided output array.
 
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 ## Usage
 
 ```javascript
 var headerDir = require( '@stdlib/strided/napi/smskmap' );
 ```
 
 #### headerDir
 
 Absolute file path for the directory containing header files for C APIs.
 
 ```javascript
 var dir = headerDir;
 // returns <string>
 ```
 
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 ## Examples
 
 ```javascript
 var headerDir = require( '@stdlib/strided/napi/smskmap' );
 
 console.log( headerDir );
 // => <string>
 ```
 
 </section>
 
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 * * *
 
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 ## C APIs
 
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 ### Usage
 
 ```c
 #include "stdlib/strided/napi/smskmap.h"
 ```
 
 #### stdlib_strided_napi_smskmap( env, info, fcn )
 
 Invokes a strided array interface which applies a unary callback accepting and returning single-precision floating-point numbers to each element in a single-precision floating-point strided input array according to a corresponding element in a strided mask array and assigns results to elements in a single-precision floating-point strided output array.
 
 ```c
 #include <node_api.h>
 
 // ...
 
 static float identityf( const float x ) {
     return x;
 }
 
 // ...
 
 /**
 * Receives JavaScript callback invocation data.
 *
 * @param env    environment under which the function is invoked
 * @param info   callback data
 * @return       Node-API value
 */
 napi_value addon( napi_env env, napi_callback_info info ) {
     stdlib_strided_napi_smskmap( env, info, identityf );
     return NULL;
 }
 
 // ...
 ```
 
 The function accepts the following arguments:
 
 -   **env**: `[in] napi_env` environment under which the function is invoked.
 -   **info**: `[in] napi_callback_info` callback data.
 -   **fcn**: `[in] float (*fcn)( float )` unary callback.
 
 ```c
 void stdlib_strided_napi_smskmap( napi_env env, napi_callback_info info, float (*fcn)( float ) );
 ```
 
 #### STDLIB_STRIDED_NAPI_MODULE_SMSKMAP( clbk )
 
 Macro for registering a Node-API module exporting a strided array interface for applying a unary callback accepting and return single-precision floating-point numbers to each element in a single-precision floating-point strided input array according to a corresponding element in a strided mask array and assigning results to elements in a single-precision floating-point strided output array.
 
 ```c
 static float scale( const float x ) {
     return x * 10.0f;
 }
 
 // ...
 
 // Register a Node-API module:
 STDLIB_STRIDED_NAPI_MODULE_SMSKMAP( scale );
 ```
 
 The macro expects the following arguments:
 
 -   **clbk**: `float (*fcn)( float )` unary callback.
 
 When used, this macro should be used **instead of** `NAPI_MODULE`. The macro includes `NAPI_MODULE`, thus ensuring Node-API module registration.
 
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 ### Notes
 
 -   The function expects that the callback `info` argument provides access to the following JavaScript arguments:
 
     -   `N`: number of indexed elements.
     -   `X`: input [`Float32Array`][@stdlib/array/float32].
     -   `strideX`: `X` stride length.
     -   `Mask`: mask [`Uint8Array`][@stdlib/array/uint8].
     -   `strideMask`: `Mask` stride length.
     -   `Y`: destination [`Float32Array`][@stdlib/array/float32].
     -   `strideY`: `Y` stride length.
 
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 [@stdlib/array/float32]: https://www.npmjs.com/package/@stdlib/array-float32
 
 [@stdlib/array/uint8]: https://www.npmjs.com/package/@stdlib/array-uint8
 
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