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Apache-2.0\n\nCopyright (c) 2020 The Stdlib Authors.\n\nLicensed under the Apache License, Version 2.0 (the \"License\");\nyou may not use this file except in compliance with the License.\nYou may obtain a copy of the License at\n\n   http://www.apache.org/licenses/LICENSE-2.0\n\nUnless required by applicable law or agreed to in writing, software\ndistributed under the License is distributed on an \"AS IS\" BASIS,\nWITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\nSee the License for the specific language governing permissions and\nlimitations under the License.\n\n--\u003e\n\n\n\u003cdetails\u003e\n  \u003csummary\u003e\n    About stdlib...\n  \u003c/summary\u003e\n  \u003cp\u003eWe 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.\u003c/p\u003e\n  \u003cp\u003eThe 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.\u003c/p\u003e\n  \u003cp\u003eWhen 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.\u003c/p\u003e\n  \u003cp\u003eTo join us in bringing numerical computing to the web, get started by checking us out on \u003ca href=\"https://github.com/stdlib-js/stdlib\"\u003eGitHub\u003c/a\u003e, and please consider \u003ca href=\"https://opencollective.com/stdlib\"\u003efinancially supporting stdlib\u003c/a\u003e. We greatly appreciate your continued support!\u003c/p\u003e\n\u003c/details\u003e\n\n# Function Object\n\n[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] \u003c!-- [![dependencies][dependencies-image]][dependencies-url] --\u003e\n\n\u003e C APIs for creating and managing strided array function objects.\n\n\u003c!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. --\u003e\n\n\u003csection class=\"intro\"\u003e\n\n\u003c/section\u003e\n\n\u003c!-- /.intro --\u003e\n\n\u003c!-- Package usage documentation. --\u003e\n\n\u003csection class=\"installation\"\u003e\n\n## Installation\n\n```bash\nnpm install @stdlib/strided-base-function-object\n```\n\nAlternatively,\n\n-   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]).\n-   If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions).\n-   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]).\n\nThe [branches.md][branches-url] file summarizes the available branches and displays a diagram illustrating their relationships.\n\nTo 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.\n\n\u003c/section\u003e\n\n\u003csection class=\"usage\"\u003e\n\n## Usage\n\n```javascript\nvar headerDir = require( '@stdlib/strided-base-function-object' );\n```\n\n#### headerDir\n\nAbsolute file path for the directory containing header files for C APIs.\n\n```javascript\nvar dir = headerDir;\n// returns \u003cstring\u003e\n```\n\n\u003c/section\u003e\n\n\u003c!-- /.usage --\u003e\n\n\u003c!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. --\u003e\n\n\u003csection class=\"notes\"\u003e\n\n\u003c/section\u003e\n\n\u003c!-- /.notes --\u003e\n\n\u003c!-- Package usage examples. --\u003e\n\n\u003csection class=\"examples\"\u003e\n\n## Examples\n\n```javascript\nvar headerDir = require( '@stdlib/strided-base-function-object' );\n\nconsole.log( headerDir );\n```\n\n\u003c/section\u003e\n\n\u003c!-- /.examples --\u003e\n\n\u003c!-- C interface documentation. --\u003e\n\n* * *\n\n\u003csection class=\"c\"\u003e\n\n## C APIs\n\n\u003c!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. --\u003e\n\n\u003csection class=\"intro\"\u003e\n\n\u003c/section\u003e\n\n\u003c!-- /.intro --\u003e\n\n\u003c!-- C usage documentation. --\u003e\n\n\u003csection class=\"usage\"\u003e\n\n### Usage\n\n```c\n#include \"stdlib/strided/base/function_object.h\"\n```\n\n#### StridedFunctionObject\n\nStructure for grouping strided array function information.\n\n```c\nstruct StridedFunctionObject {\n    // Strided array function name:\n    const char *name;\n\n    // Number of input strided arrays:\n    int32_t nin;\n\n    // Number of output strided arrays:\n    int32_t nout;\n\n    // Total number of strided array arguments (nin + nout):\n    int32_t narrays;\n\n    // Array containing strided array functions:\n    StridedArrayFcn *functions;\n\n    // Number of strided array functions:\n    int32_t nfunctions;\n\n    // 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:\n    int32_t *types;\n\n    // 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):\n    void **data;\n};\n```\n\n#### StridedArrayFcn\n\nFunction pointer type for a strided array function.\n\n```c\ntypedef void (*StridedArrayFcn)( uint8_t *arrays[], int64_t *shape, int64_t *strides, void *data );\n```\n\nA `StridedArrayFcn` function should accept the following arguments:\n\n-   **arrays**: `[in] uint8_t**` array containing pointers to both input and output strided arrays.\n-   **shape**: `[in] int64_t*` array whose only element is the number of elements over which to iterate.\n-   **strided**: `[in] int64_t*` array containing strides (in bytes) for each strided array.\n-   **data**: `[in] void*` function data (e.g., a callback).\n\n\u003c!-- lint disable maximum-heading-length --\u003e\n\n#### stdlib_strided_function_allocate( \\_name, nin, nout, \\_functions, nfunctions, \\_types, \\_data\\[] )\n\nReturns a pointer to a dynamically allocated strided array function object.\n\n```c\n#include \"stdlib/strided/base/unary.h\"\n#include \"stdlib/strided/dtypes.h\"\n#include \u003cstdlib.h\u003e\n#include \u003cstdio.h\u003e\n\n// Define the function(s) we want to apply to strided arrays:\ndouble scale( const double x ) {\n    return x * 10.0;\n}\n\n// Define a function name:\nconst char name[] = \"unary_strided_array_function\";\n\n// 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):\nStridedArrayFcn functions[] = {\n    stdlib_strided_d_d,\n    stdlib_strided_f_f_as_d_d,\n    stdlib_strided_u_d_as_d_d,\n    stdlib_strided_i_d_as_d_d,\n    stdlib_strided_t_d_as_d_d,\n    stdlib_strided_k_d_as_d_d,\n    stdlib_strided_b_d_as_d_d,\n    stdlib_strided_s_d_as_d_d\n};\n\n// Define the **strided array** argument types for each strided array function:\nint32_t types[] = {\n    STDLIB_STRIDED_FLOAT64, STDLIB_STRIDED_FLOAT64,\n    STDLIB_STRIDED_FLOAT32, STDLIB_STRIDED_FLOAT64,\n    STDLIB_STRIDED_UINT32, STDLIB_STRIDED_FLOAT64,\n    STDLIB_STRIDED_INT32, STDLIB_STRIDED_FLOAT64,\n    STDLIB_STRIDED_UINT16, STDLIB_STRIDED_FLOAT64,\n    STDLIB_STRIDED_INT16, STDLIB_STRIDED_FLOAT64,\n    STDLIB_STRIDED_UINT8, STDLIB_STRIDED_FLOAT64,\n    STDLIB_STRIDED_INT8, STDLIB_STRIDED_FLOAT64\n};\n\n// Define a list of strided array function \"data\" (in this case, callbacks):\nvoid *data[] = {\n    (void *)scale,\n    (void *)scale,\n    (void *)scale,\n    (void *)scale,\n    (void *)scale,\n    (void *)scale,\n    (void *)scale,\n    (void *)scale\n};\n\n// Create a new strided function object:\nstruct StridedFunctionObject *obj = stdlib_strided_function_allocate( name, 1, 1, functions, 8, types, data );\nif ( obj == NULL ) {\n    fprintf( stderr, \"Error allocating memory.\\n\" );\n    exit( 1 );\n}\n\n// Free allocated memory:\nstdlib_strided_function_free( obj );\n```\n\nThe function accepts the following arguments:\n\n-   **name**: `[in] char*` strided array function name.\n-   **nin**: `[in] int32_t` number of input strided arrays.\n-   **nout**: `[in] int32_t` number of output strided arrays.\n-   **functions**: `[in] StridedArrayFcn*` array containing strided array functions.\n-   **nfunctions**: `[in] int32_t` number of strided array functions.\n-   **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.\n-   **data**: `[in] void*` array of void pointers corresponding to the \"data\" (e.g., callbacks) which should be passed to a respective strided array function.\n\n```c\nstruct StridedFunctionObject * stdlib_strided_function_allocate( const char *name, int32_t nin, int32_t nout, StridedArrayFcn *functions, int32_t nfunctions, int32_t *types, void *data[] )\n```\n\nThe 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.\n\n#### stdlib_strided_function_free( \\*obj )\n\nFrees a strided array function object's allocated memory.\n\n```c\n#include \"stdlib/strided/base/unary.h\"\n#include \"stdlib/strided/dtypes.h\"\n#include \u003cstdlib.h\u003e\n#include \u003cstdio.h\u003e\n\n// Define the function(s) we want to apply to strided arrays:\ndouble scale( const double x ) {\n    return x * 10.0;\n}\n\n// Define a function name:\nconst char name[] = \"unary_strided_array_function\";\n\n// Define a list of strided array functions:\nStridedArrayFcn functions[] = {\n    stdlib_strided_d_d\n};\n\n// Define the **strided array** argument types for each strided array function:\nint32_t types[] = {\n    STDLIB_STRIDED_FLOAT64, STDLIB_STRIDED_FLOAT64\n};\n\n// Define a list of strided array function \"data\" (in this case, callbacks):\nvoid *data[] = {\n    (void *)scale\n};\n\n// Create a new strided function object:\nstruct StridedFunctionObject *obj = stdlib_strided_function_allocate( name, 1, 1, functions, 1, types, data );\nif ( obj == NULL ) {\n    fprintf( stderr, \"Error allocating memory.\\n\" );\n    exit( 1 );\n}\n\n// ...\n\n// Free allocated memory:\nstdlib_strided_function_free( obj );\n```\n\nThe function accepts the following arguments:\n\n-   **obj**: `[in] StridedFunctionObject*` strided array function object.\n\n```c\nvoid stdlib_strided_function_free( struct StridedFunctionObject *obj )\n```\n\n#### stdlib_strided_function_dispatch_index_of( \\_obj, \\_types )\n\nReturns the first index of a function whose signature satisfies a provided list of array types.\n\n```c\n#include \"stdlib/strided/base/unary.h\"\n#include \"stdlib/strided/dtypes.h\"\n#include \u003cstdlib.h\u003e\n#include \u003cstdio.h\u003e\n\n// Define the function(s) we want to apply to strided arrays:\ndouble scale( const double x ) {\n    return x * 10.0;\n}\n\n// ...\n\n// Define a function name:\nconst char name[] = \"unary_strided_array_function\";\n\n// Define a list of strided array functions:\nStridedArrayFcn functions[] = {\n    stdlib_strided_d_d,\n    stdlib_strided_f_f_as_d_d\n};\n\n// Define the **strided array** argument types for each strided array function:\nint32_t types[] = {\n    STDLIB_STRIDED_FLOAT64, STDLIB_STRIDED_FLOAT64,\n    STDLIB_STRIDED_FLOAT32, STDLIB_STRIDED_FLOAT64\n};\n\n// Define a list of strided array function \"data\" (in this case, callbacks):\nvoid *data[] = {\n    (void *)scale,\n    (void *)scale\n};\n\n// Create a new strided function object:\nstruct StridedFunctionObject *obj = stdlib_strided_function_allocate( name, 1, 1, functions, 2, types, data );\nif ( obj == NULL ) {\n    fprintf( stderr, \"Error allocating memory.\\n\" );\n    exit( 1 );\n}\n\n// ...\n\n// Define a list of types on which to dispatch:\nint32_t itypes[] = {\n    STDLIB_STRIDED_FLOAT32, STDLIB_STRIDED_FLOAT64\n};\n\n// Find a function satisfying the list of types:\nint64_t idx = stdlib_strided_function_dispatch_index_of( obj, itypes );\nif ( idx \u003c 0 ) {\n    fprintf( stderr, \"Unable to find function.\\n\" );\n    exit( 1 );\n}\n\n// ...\n\n// Free allocated memory:\nstdlib_strided_function_free( obj );\n```\n\nThe function accepts the following arguments:\n\n-   **obj**: `[in] StridedFunctionObject*` strided array function object.\n-   **types**: `[in] int32_t*` list of array types on which to dispatch.\n\n```c\nint64_t stdlib_strided_function_dispatch_index_of( const struct StridedFunctionObject *obj, const int32_t *types )\n```\n\nIf a function is found, the function returns the index of the function, and the function returns `-1` if unable to find a function.\n\n\u003c/section\u003e\n\n\u003c!-- /.usage --\u003e\n\n\u003c!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. --\u003e\n\n\u003csection class=\"notes\"\u003e\n\n\u003c/section\u003e\n\n\u003c!-- /.notes --\u003e\n\n\u003c!-- C API usage examples. --\u003e\n\n\u003csection class=\"examples\"\u003e\n\n\u003c/section\u003e\n\n\u003c!-- /.examples --\u003e\n\n\u003c/section\u003e\n\n\u003c!-- /.c --\u003e\n\n\u003c!-- Section to include cited references. If references are included, add a horizontal rule *before* the section. Make sure to keep an empty line after the `section` element and another before the `/section` close. --\u003e\n\n\u003csection class=\"references\"\u003e\n\n\u003c/section\u003e\n\n\u003c!-- /.references --\u003e\n\n\u003c!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. --\u003e\n\n\u003csection class=\"related\"\u003e\n\n\u003c/section\u003e\n\n\u003c!-- /.related --\u003e\n\n\u003c!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. --\u003e\n\n\n\u003csection class=\"main-repo\" \u003e\n\n* * *\n\n## Notice\n\nThis 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.\n\nFor 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].\n\n#### Community\n\n[![Chat][chat-image]][chat-url]\n\n---\n\n## License\n\nSee [LICENSE][stdlib-license].\n\n\n## Copyright\n\nCopyright \u0026copy; 2016-2025. The Stdlib [Authors][stdlib-authors].\n\n\u003c/section\u003e\n\n\u003c!-- /.stdlib --\u003e\n\n\u003c!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. --\u003e\n\n\u003csection class=\"links\"\u003e\n\n[npm-image]: http://img.shields.io/npm/v/@stdlib/strided-base-function-object.svg\n[npm-url]: https://npmjs.org/package/@stdlib/strided-base-function-object\n\n[test-image]: https://github.com/stdlib-js/strided-base-function-object/actions/workflows/test.yml/badge.svg?branch=main\n[test-url]: https://github.com/stdlib-js/strided-base-function-object/actions/workflows/test.yml?query=branch:main\n\n[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/strided-base-function-object/main.svg\n[coverage-url]: https://codecov.io/github/stdlib-js/strided-base-function-object?branch=main\n\n\u003c!--\n\n[dependencies-image]: https://img.shields.io/david/stdlib-js/strided-base-function-object.svg\n[dependencies-url]: https://david-dm.org/stdlib-js/strided-base-function-object/main\n\n--\u003e\n\n[chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg\n[chat-url]: https://app.gitter.im/#/room/#stdlib-js_stdlib:gitter.im\n\n[stdlib]: https://github.com/stdlib-js/stdlib\n\n[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors\n\n[umd]: https://github.com/umdjs/umd\n[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules\n\n[deno-url]: https://github.com/stdlib-js/strided-base-function-object/tree/deno\n[deno-readme]: https://github.com/stdlib-js/strided-base-function-object/blob/deno/README.md\n[umd-url]: https://github.com/stdlib-js/strided-base-function-object/tree/umd\n[umd-readme]: https://github.com/stdlib-js/strided-base-function-object/blob/umd/README.md\n[esm-url]: https://github.com/stdlib-js/strided-base-function-object/tree/esm\n[esm-readme]: https://github.com/stdlib-js/strided-base-function-object/blob/esm/README.md\n[branches-url]: https://github.com/stdlib-js/strided-base-function-object/blob/main/branches.md\n\n[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/strided-base-function-object/main/LICENSE\n\n\u003c/section\u003e\n\n\u003c!-- /.links --\u003e\n","funding_links":["https://github.com/sponsors/stdlib-js","https://opencollective.com/stdlib","https://tidelift.com/funding/github/npm/@stdlib/stdlib"],"categories":[],"sub_categories":[],"project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fstdlib-js%2Fstrided-base-function-object","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fstdlib-js%2Fstrided-base-function-object","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fstdlib-js%2Fstrided-base-function-object/lists"}