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@stdlib/napi-argv-float
Advanced tools
Convert a Node-API value to a single-precision floating-point number.
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!
Convert a Node-API value to a single-precision floating-point number.
npm install @stdlib/napi-argv-float
var headerDir = require( '@stdlib/napi-argv-float' );
Absolute file path for the directory containing header files for C APIs.
var dir = headerDir;
// returns <string>
var headerDir = require( '@stdlib/napi-argv-float' );
console.log( headerDir );
// => <string>
#include "stdlib/napi/argv_float.h"
Converts a Node-API value to a single-precision floating-point number.
#include "stdlib/napi/argv_float.h"
#include <node_api.h>
static napi_value addon( napi_env env, napi_callback_info info ) {
napi_value value;
// ...
float out;
napi_value err;
napi_status status = stdlib_napi_argv_float( env, value, &out, "Must be a number.", &err );
assert( status == napi_ok );
if ( err != NULL ) {
assert( napi_throw( env, err ) == napi_ok );
return NULL;
}
// ...
}
The function accepts the following arguments:
[in] napi_env
environment under which the function is invoked.[in] napi_value
Node-API value.[out] float*
destination for storing output value.[in] char*
error message.[out] napi_value*
pointer for storing a JavaScript error. If not provided a number, the function sets err
with a JavaScript error; otherwise, err
is set to NULL
.napi_status stdlib_napi_argv_float( const napi_env env, const napi_value value, float *out, const char *message, napi_value *err );
The function returns a napi_status
status code indicating success or failure (returns napi_ok
if success).
Macro for converting an add-on callback argument to a single-precision floating-point number.
#include "stdlib/napi/argv_float.h"
#include "stdlib/napi/argv.h"
#include <node_api.h>
static float fcn( const float v ) {
return v;
}
// ...
static napi_value addon( napi_env env, napi_callback_info info ) {
// Retrieve add-on callback arguments:
STDLIB_NAPI_ARGV( env, info, argv, argc, 1 );
// Convert the first argument to a C type:
STDLIB_NAPI_ARGV_FLOAT( env, value, argv, 0 );
// ...
float out = fcn( value );
}
The macro expects the following arguments:
This package is part of 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, see the main project repository.
See LICENSE.
Copyright © 2016-2024. The Stdlib Authors.
0.2.0 (2024-02-14)
<section class="commits">46d049b
- build: replace tslint directive (by Philipp Burckhardt)A total of 1 person contributed to this release. Thank you to this contributor:
FAQs
Convert a Node-API value to a single-precision floating-point number.
The npm package @stdlib/napi-argv-float receives a total of 106 weekly downloads. As such, @stdlib/napi-argv-float popularity was classified as not popular.
We found that @stdlib/napi-argv-float demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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