time-to-botec/js/node_modules/@stdlib/math/base/napi/unary/README.md

unary

C APIs for registering a Node-API module exporting interfaces for invoking unary numerical functions.

Usage

var headerDir = require( '@stdlib/math/base/napi/unary' );

headerDir

Absolute file path for the directory containing header files for C APIs.

var dir = headerDir;
// returns <string>

Examples

var headerDir = require( '@stdlib/math/base/napi/unary' );

console.log( headerDir );
// => <string>

---

C APIs

Usage

#include "stdlib/math/base/napi/unary.h"

stdlib_math_base_napi_d_d( env, info, fcn )

Invokes a unary function accepting and returning double-precision floating-point numbers.

#include <node_api.h>

// ...

static double identity( const double 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 ) {
    return stdlib_math_base_napi_d_d( env, info, identity );
}

// ...

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] double (*fcn)( double ) unary function.

void stdlib_math_base_napi_d_d( napi_env env, napi_callback_info info, double (*fcn)( double ) );

stdlib_math_base_napi_f_f( env, info, fcn )

Invokes a unary function accepting and returning single-precision floating-point numbers.

#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 ) {
    return stdlib_math_base_napi_f_f( env, info, identityf );
}

// ...

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 function.

void stdlib_math_base_napi_f_f( napi_env env, napi_callback_info info, float (*fcn)( float ) );

stdlib_math_base_napi_i_i( env, info, fcn )

Invokes a unary function accepting and returning 32-bit signed integers.

#include <node_api.h>
#include <stdint.h>

// ...

static int32_t identity( const int32_t 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 ) {
    return stdlib_math_base_napi_i_i( env, info, identity );
}

// ...

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] int32_t (*fcn)( int32_t ) unary function.

void stdlib_math_base_napi_i_i( napi_env env, napi_callback_info info, int32_t (*fcn)( int32_t ) );

STDLIB_MATH_BASE_NAPI_MODULE_D_D( fcn )

Macro for registering a Node-API module exporting an interface for invoking a unary function accepting and returning double-precision floating-point numbers.

static double scale( const double x ) {
    return x * 10.0;
}

// ...

// Register a Node-API module:
STDLIB_MATH_BASE_NAPI_MODULE_D_D( scale );

The macro expects the following arguments:

• fcn: double (*fcn)( double ) unary function.

When used, this macro should be used instead of NAPI_MODULE. The macro includes NAPI_MODULE, thus ensuring Node-API module registration.

STDLIB_MATH_BASE_NAPI_MODULE_F_F( fcn )

Macro for registering a Node-API module exporting an interface for invoking a unary function accepting and returning single-precision floating-point numbers.

static float scale( const float x ) {
    return x * 10.0f;
}

// ...

// Register a Node-API module:
STDLIB_MATH_BASE_NAPI_MODULE_F_F( scale );

The macro expects the following arguments:

• fcn: float (*fcn)( float ) unary function.

When used, this macro should be used instead of NAPI_MODULE. The macro includes NAPI_MODULE, thus ensuring Node-API module registration.

STDLIB_MATH_BASE_NAPI_MODULE_I_I( fcn )

Macro for registering a Node-API module exporting an interface for invoking a unary function accepting and returning 32-bit signed integers.

#include <stdint.h>

static int32_t scale( const int32_t x ) {
    return x * 10;
}

// ...

// Register a Node-API module:
STDLIB_MATH_BASE_NAPI_MODULE_I_I( scale );

The macro expects the following arguments:

• fcn: int32_t (*fcn)( int32_t ) unary function.

When used, this macro should be used instead of NAPI_MODULE. The macro includes NAPI_MODULE, thus ensuring Node-API module registration.

Notes

• The C-API functions expect that the callback info argument provides access to the following JavaScript arguments:

  • x: input value.