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* @license Apache-2.0
*
* Copyright (c) 2023 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var shape2strides = require( '@stdlib/ndarray/base/shape2strides' );
var strides2offset = require( '@stdlib/ndarray/base/strides2offset' );
var resolveStr = require( '@stdlib/ndarray/base/dtype-resolve-str' );
var ndarray = require( '@stdlib/ndarray/base/ctor' );
var numel = require( '@stdlib/ndarray/base/numel' );
var emptyArray = require( '@stdlib/array/empty' );
var allocUnsafe = require( '@stdlib/buffer/alloc-unsafe' );
// MAIN //
/**
* Creates an uninitialized ndarray having a specified shape and data type.
*
* @param {*} dtype - data type
* @param {NonNegativeIntegerArray} shape - array shape
* @param {string} order - array order
* @throws {TypeError} first argument must be a recognized data type
* @returns {ndarray} ndarray
*
* @example
* var getShape = require( '@stdlib/ndarray/shape' );
* var getDType = require( '@stdlib/ndarray/dtype' );
*
* var arr = empty( 'float32', [ 2, 2 ], 'row-major' );
* // returns <ndarray>
*
* var sh = getShape( arr );
* // returns [ 2, 2 ]
*
* var dt = String( getDType( arr ) );
* // returns 'float32'
*/
function empty( dtype, shape, order ) {
var ndims;
var buf;
var len;
var st;
var dt;
ndims = shape.length;
if ( ndims > 0 ) {
len = numel( shape );
st = shape2strides( shape, order );
} else {
// For 0-dimensional arrays, the buffer should contain a single element...
len = 1;
st = [ 0 ];
}
dt = resolveStr( dtype );
if ( dt === 'binary' ) {
buf = allocUnsafe( len );
} else {
buf = emptyArray( len, dt );
}
// FIXME: add support for struct dtypes. Will need to do something similar to `array/empty` in so far as allocating an uninitialized array buffer, performing byte alignment, and creating a StructArray view atop the buffer.
return new ndarray( dtype, buf, shape, st, strides2offset( shape, st ), order ); // eslint-disable-line max-len
}
// EXPORTS //
module.exports = empty;
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