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Convert a double-precision floating-point number to a Node-API value.
npm install @stdlib/napi-create-double
var headerDir = require( '@stdlib/napi-create-double' );
Absolute file path for the directory containing header files for C APIs.
var dir = headerDir;
// returns <string>
var headerDir = require( '@stdlib/napi-create-double' );
console.log( headerDir );
// => <string>
#include "stdlib/napi/create_double.h"
Converts a double-precision floating-point number to a Node-API value.
#include "stdlib/napi/create_double.h"
#include <node_api.h>
static napi_value addon( napi_env env, napi_callback_info info ) {
// ...
napi_value value;
napi_status status = stdlib_napi_create_double( env, 1.0, &value );
assert( status == napi_ok );
if ( err != NULL ) {
assert( napi_throw( env, err ) == napi_ok );
return NULL;
}
// ...
}
The function accepts the following arguments:
-
env:
[in] napi_env
environment under which the function is invoked. -
value:
[in] double
double-precision floating-point number. -
out:
[out] napi_value*
destination for storing output value.
napi_status stdlib_napi_create_double( const napi_env env, const double value, napi_value *out );
The function returns a napi_status
status code indicating success or failure (returns napi_ok
if success).
Macro for converting a double-precision floating-point number to a Node-API value.
#include "stdlib/napi/create_double.h"
#include "stdlib/napi/argv_double.h"
#include "stdlib/napi/argv.h"
#include <node_api.h>
static double fcn( const double 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_DOUBLE( env, value, argv, 0 );
// ...
// Convert a value having a C type to a Node-API value:
STDLIB_NAPI_CREATE_DOUBLE( env, fcn( value ), out );
return out;
}
The macro expects the following arguments:
- env: environment under which the callback is invoked.
- expression: expression returning a double-precision floating-point number.
- name: output variable name.
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.
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