function csignumf( z ) {
	var v = addon( z );
	return new Complex64( v.re, v.im );
}
Evaluates the signum function of a single-precision floating-point complex number.

@private
@param {Complex64} z - complex number
@returns {Complex64} result

@example
var Complex64 = require( '@stdlib/complex/float32/ctor' );
var real = require( '@stdlib/complex/float32/real' );
var imag = require( '@stdlib/complex/float32/imag' );

var v = csignumf( new Complex64( -4.2, 5.5 ) );
// returns <Complex64>

var re = real( v );
// returns ~-0.607

var im = imag( v );
// returns ~0.795

v = csignumf( new Complex64( 0.0, 0.0 ) );
// returns <Complex64>

re = real( v );
// returns 0.0

im = imag( v );
// returns 0.0

v = csignumf( new Complex64( NaN, NaN ) );
// returns <Complex64>

re = real( v );
// returns NaN

im = imag( v );
// returns NaN