text: /**
  * @license Apache-2.0
  *
  * Copyright (c) 2018 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 objectKeys = require( '@stdlib/utils/keys' );
  var hasOwnProp = require( '@stdlib/assert/has-own-property' );
  var resolve = require( './../../base/dtype-resolve-str' );
  var SAFE_CASTS = require( './safe_casts.json' );
  
  
  // VARIABLES //
  
  var TABLE;
  
  
  // FUNCTIONS //
  
  /**
  * Generates a full table of safe casts for each ndarray data type.
  *
  * @private
  * @returns {Object} table
  */
  function generateFullTable() {
  	var dtypes;
  	var ntypes;
  	var out;
  	var tmp;
  	var dt1;
  	var dt2;
  	var o;
  	var j;
  	var i;
  
  	out = {};
  	dtypes = objectKeys( SAFE_CASTS );
  	ntypes = dtypes.length;
  	for ( i = 0; i < ntypes; i++ ) {
  		dt1 = dtypes[ i ];
  		o = SAFE_CASTS[ dt1 ];
  		tmp = {};
  		for ( j = 0; j < ntypes; j++ ) {
  			dt2 = dtypes[ j ];
  			tmp[ dt2 ] = o[ dt2 ];
  		}
  		out[ dt1 ] = tmp;
  	}
  	return out;
  }
  
  /**
  * Generates a table of safe casts for each ndarray data type.
  *
  * @private
  * @returns {Object} table
  */
  function generateTable() {
  	var dtypes;
  	var ntypes;
  	var out;
  	var tmp;
  	var dt1;
  	var dt2;
  	var o;
  	var j;
  	var i;
  
  	out = {};
  	dtypes = objectKeys( SAFE_CASTS );
  	ntypes = dtypes.length;
  	for ( i = 0; i < ntypes; i++ ) {
  		dt1 = dtypes[ i ];
  		o = SAFE_CASTS[ dt1 ];
  		tmp = [];
  		for ( j = 0; j < ntypes; j++ ) {
  			dt2 = dtypes[ j ];
  			if ( o[ dt2 ] === 1 ) {
  				tmp.push( dt2 );
  			}
  		}
  		out[ dt1 ] = tmp;
  	}
  	return out;
  }
  
  
  // MAIN //
  
  /**
  * Returns a list of ndarray data types to which a provided ndarray data type can be safely cast.
  *
  * @param {*} [dtype] - ndarray data type value
  * @returns {(Object|StringArray|null)} list of ndarray data types or null
  *
  * @example
  * var list = safeCasts( 'float32' );
  * // returns [...]
  */
  function safeCasts( dtype ) {
  	if ( arguments.length === 0 ) {
  		return generateFullTable();
  	}
  	if ( TABLE === void 0 ) {
  		// Lazily generate table...
  		TABLE = generateTable();
  	}
  	dtype = resolve( dtype );
  	if ( hasOwnProp( TABLE, dtype ) ) {
  		return TABLE[ dtype ].slice();
  	}
  	return null;
  }
  
  
  // EXPORTS //
  
  module.exports = safeCasts;
  