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@stdlib/strided-base-function-object

C APIs for creating and managing strided array function objects.

https://github.com/stdlib-js/strided-base-function-object

Science Score: 44.0%

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Keywords

array base c fcn function javascript n-api napi node node-js nodejs stdlib strided
Last synced: 4 months ago · JSON representation ·

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C APIs for creating and managing strided array function objects.

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array base c fcn function javascript n-api napi node node-js nodejs stdlib strided
Created over 4 years ago · Last pushed 5 months ago
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README.md

About stdlib...

We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!

Function Object

NPM version Build Status Coverage Status <!-- dependencies -->

C APIs for creating and managing strided array function objects.

## Installation ```bash npm install @stdlib/strided-base-function-object ``` Alternatively, - To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]). - If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions). - For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]). The [branches.md][branches-url] file summarizes the available branches and displays a diagram illustrating their relationships. To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.
## Usage ```javascript var headerDir = require( '@stdlib/strided-base-function-object' ); ``` #### headerDir Absolute file path for the directory containing header files for C APIs. ```javascript var dir = headerDir; // returns ```
## Examples ```javascript var headerDir = require( '@stdlib/strided-base-function-object' ); console.log( headerDir ); ```
## C APIs
### Usage ```c #include "stdlib/strided/base/function_object.h" ``` #### StridedFunctionObject Structure for grouping strided array function information. ```c struct StridedFunctionObject { // Strided array function name: const char *name; // Number of input strided arrays: int32_t nin; // Number of output strided arrays: int32_t nout; // Total number of strided array arguments (nin + nout): int32_t narrays; // Array containing strided array functions: StridedArrayFcn *functions; // Number of strided array functions: int32_t nfunctions; // Array of type "numbers" (as enumerated elsewhere), where the total number of types equals `narrays * nfunctions` and where each set of `narrays` consecutive types (non-overlapping) corresponds to the set of strided array argument types for a corresponding strided array function: int32_t *types; // Array of void pointers corresponding to the "data" (e.g., callbacks) which should be passed to a respective strided array function (note: the number of pointers should match the number of strided array functions): void **data; }; ``` #### StridedArrayFcn Function pointer type for a strided array function. ```c typedef void (*StridedArrayFcn)( uint8_t *arrays[], int64_t *shape, int64_t *strides, void *data ); ``` A `StridedArrayFcn` function should accept the following arguments: - **arrays**: `[in] uint8_t**` array containing pointers to both input and output strided arrays. - **shape**: `[in] int64_t*` array whose only element is the number of elements over which to iterate. - **strided**: `[in] int64_t*` array containing strides (in bytes) for each strided array. - **data**: `[in] void*` function data (e.g., a callback). #### stdlib_strided_function_allocate( \_name, nin, nout, \_functions, nfunctions, \_types, \_data\[] ) Returns a pointer to a dynamically allocated strided array function object. ```c #include "stdlib/strided/base/unary.h" #include "stdlib/strided/dtypes.h" #include #include // Define the function(s) we want to apply to strided arrays: double scale( const double x ) { return x * 10.0; } // Define a function name: const char name[] = "unary_strided_array_function"; // Define a list of strided array functions (in this case, as the function to be applied accepts doubles, we only use strided array functions which handle doubles as function arguments and, for the purposes of this example, we assume that the output strided array is always a double-precision floating-point number array): StridedArrayFcn functions[] = { stdlib_strided_d_d, stdlib_strided_f_f_as_d_d, stdlib_strided_u_d_as_d_d, stdlib_strided_i_d_as_d_d, stdlib_strided_t_d_as_d_d, stdlib_strided_k_d_as_d_d, stdlib_strided_b_d_as_d_d, stdlib_strided_s_d_as_d_d }; // Define the **strided array** argument types for each strided array function: int32_t types[] = { STDLIB_STRIDED_FLOAT64, STDLIB_STRIDED_FLOAT64, STDLIB_STRIDED_FLOAT32, STDLIB_STRIDED_FLOAT64, STDLIB_STRIDED_UINT32, STDLIB_STRIDED_FLOAT64, STDLIB_STRIDED_INT32, STDLIB_STRIDED_FLOAT64, STDLIB_STRIDED_UINT16, STDLIB_STRIDED_FLOAT64, STDLIB_STRIDED_INT16, STDLIB_STRIDED_FLOAT64, STDLIB_STRIDED_UINT8, STDLIB_STRIDED_FLOAT64, STDLIB_STRIDED_INT8, STDLIB_STRIDED_FLOAT64 }; // Define a list of strided array function "data" (in this case, callbacks): void *data[] = { (void *)scale, (void *)scale, (void *)scale, (void *)scale, (void *)scale, (void *)scale, (void *)scale, (void *)scale }; // Create a new strided function object: struct StridedFunctionObject *obj = stdlib_strided_function_allocate( name, 1, 1, functions, 8, types, data ); if ( obj == NULL ) { fprintf( stderr, "Error allocating memory.\n" ); exit( 1 ); } // Free allocated memory: stdlib_strided_function_free( obj ); ``` The function accepts the following arguments: - **name**: `[in] char*` strided array function name. - **nin**: `[in] int32_t` number of input strided arrays. - **nout**: `[in] int32_t` number of output strided arrays. - **functions**: `[in] StridedArrayFcn*` array containing strided array functions. - **nfunctions**: `[in] int32_t` number of strided array functions. - **types**: `[in] int32_t*` array of type "numbers", where the total number of types equals `(nin+nout)*nfunctions` and where each set of `nin+nout` consecutive types (non-overlapping) corresponds to the set of strided array argument types for a corresponding strided array function. - **data**: `[in] void*` array of void pointers corresponding to the "data" (e.g., callbacks) which should be passed to a respective strided array function. ```c struct StridedFunctionObject * stdlib_strided_function_allocate( const char *name, int32_t nin, int32_t nout, StridedArrayFcn *functions, int32_t nfunctions, int32_t *types, void *data[] ) ``` The function returns a pointer to a dynamically allocated strided array function or, if unable to allocate memory, a null pointer. The **user** is responsible for freeing the allocated memory. #### stdlib_strided_function_free( \*obj ) Frees a strided array function object's allocated memory. ```c #include "stdlib/strided/base/unary.h" #include "stdlib/strided/dtypes.h" #include #include // Define the function(s) we want to apply to strided arrays: double scale( const double x ) { return x * 10.0; } // Define a function name: const char name[] = "unary_strided_array_function"; // Define a list of strided array functions: StridedArrayFcn functions[] = { stdlib_strided_d_d }; // Define the **strided array** argument types for each strided array function: int32_t types[] = { STDLIB_STRIDED_FLOAT64, STDLIB_STRIDED_FLOAT64 }; // Define a list of strided array function "data" (in this case, callbacks): void *data[] = { (void *)scale }; // Create a new strided function object: struct StridedFunctionObject *obj = stdlib_strided_function_allocate( name, 1, 1, functions, 1, types, data ); if ( obj == NULL ) { fprintf( stderr, "Error allocating memory.\n" ); exit( 1 ); } // ... // Free allocated memory: stdlib_strided_function_free( obj ); ``` The function accepts the following arguments: - **obj**: `[in] StridedFunctionObject*` strided array function object. ```c void stdlib_strided_function_free( struct StridedFunctionObject *obj ) ``` #### stdlib_strided_function_dispatch_index_of( \_obj, \_types ) Returns the first index of a function whose signature satisfies a provided list of array types. ```c #include "stdlib/strided/base/unary.h" #include "stdlib/strided/dtypes.h" #include #include // Define the function(s) we want to apply to strided arrays: double scale( const double x ) { return x * 10.0; } // ... // Define a function name: const char name[] = "unary_strided_array_function"; // Define a list of strided array functions: StridedArrayFcn functions[] = { stdlib_strided_d_d, stdlib_strided_f_f_as_d_d }; // Define the **strided array** argument types for each strided array function: int32_t types[] = { STDLIB_STRIDED_FLOAT64, STDLIB_STRIDED_FLOAT64, STDLIB_STRIDED_FLOAT32, STDLIB_STRIDED_FLOAT64 }; // Define a list of strided array function "data" (in this case, callbacks): void *data[] = { (void *)scale, (void *)scale }; // Create a new strided function object: struct StridedFunctionObject *obj = stdlib_strided_function_allocate( name, 1, 1, functions, 2, types, data ); if ( obj == NULL ) { fprintf( stderr, "Error allocating memory.\n" ); exit( 1 ); } // ... // Define a list of types on which to dispatch: int32_t itypes[] = { STDLIB_STRIDED_FLOAT32, STDLIB_STRIDED_FLOAT64 }; // Find a function satisfying the list of types: int64_t idx = stdlib_strided_function_dispatch_index_of( obj, itypes ); if ( idx < 0 ) { fprintf( stderr, "Unable to find function.\n" ); exit( 1 ); } // ... // Free allocated memory: stdlib_strided_function_free( obj ); ``` The function accepts the following arguments: - **obj**: `[in] StridedFunctionObject*` strided array function object. - **types**: `[in] int32_t*` list of array types on which to dispatch. ```c int64_t stdlib_strided_function_dispatch_index_of( const struct StridedFunctionObject *obj, const int32_t *types ) ``` If a function is found, the function returns the index of the function, and the function returns `-1` if unable to find a function.

* * * ## Notice This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more. For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib]. #### Community [![Chat][chat-image]][chat-url] --- ## License See [LICENSE][stdlib-license]. ## Copyright Copyright © 2016-2025. The Stdlib [Authors][stdlib-authors].

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  • Name: stdlib
  • Login: stdlib-js
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Standard library for JavaScript.

Citation (CITATION.cff) 

cff-version: 1.2.0
title: stdlib
message: >-
  If you use this software, please cite it using the
  metadata from this file.

type: software

authors:
  - name: The Stdlib Authors
    url: https://github.com/stdlib-js/stdlib/graphs/contributors

repository-code: https://github.com/stdlib-js/stdlib
url: https://stdlib.io

abstract: |
  Standard library for JavaScript and Node.js.

keywords:
  - JavaScript
  - Node.js
  - TypeScript
  - standard library
  - scientific computing
  - numerical computing
  - statistical computing

license: Apache-2.0 AND BSL-1.0

date-released: 2016

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npmjs.org: @stdlib/strided-base-function-object

C APIs for creating and managing strided array function objects.

  • Homepage: https://stdlib.io
  • License: Apache-2.0
  • Latest release: 0.2.2
    published over 1 year ago
  • Versions: 13
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