function ccis( z ) {
	var v = addon( z );
	return new Complex128( v.re, v.im );
}
Evaluates the cis function for a double-precision complex floating-point number.

@private
@param {Complex128} z - complex number
@returns {Complex128} result

@example
var Complex128 = require( '@stdlib/complex/float64/ctor' );
var real = require( '@stdlib/complex/float64/real' );
var imag = require( '@stdlib/complex/float64/imag' );

var z = new Complex128( 0.0, 0.0 );
// returns <Complex128>

var out = ccis( z );
// returns <Complex128>

var re = real( out );
// returns 1.0

var im = imag( out );
// returns 0.0

@example
var Complex128 = require( '@stdlib/complex/float64/ctor' );
var real = require( '@stdlib/complex/float64/real' );
var imag = require( '@stdlib/complex/float64/imag' );

var z = new Complex128( 1.0, 0.0 );
// returns <Complex128>

var out = ccis( z );
// returns <Complex128>

var re = real( out );
// returns ~0.540

var im = imag( out );
// returns ~0.841