Function writeFloat

expfmt/text_create.go:476–497

writeFloat is equivalent to fmt.Fprint with a float64 argument but hardcodes a few common cases for increased efficiency. For non-hardcoded cases, it uses strconv.AppendFloat to avoid allocations, similar to writeInt.

(w enhancedWriter, f float64)

// a few common cases for increased efficiency. For non-hardcoded cases, it uses
// strconv.AppendFloat to avoid allocations, similar to writeInt.
func writeFloat(w enhancedWriter, f float64) (int, error) {
	switch {
	case f == 1:
		return 1, w.WriteByte('1')
	case f == 0:
		return 1, w.WriteByte('0')
	case f == -1:
		return w.WriteString("-1")
	case math.IsNaN(f):
		return w.WriteString("NaN")
	case math.IsInf(f, +1):
		return w.WriteString("+Inf")
	case math.IsInf(f, -1):
		return w.WriteString("-Inf")
	default:
		bp := numBufPool.Get().(*[]byte)
		*bp = strconv.AppendFloat((*bp)[:0], f, 'g', -1, 64)
		written, err := w.Write(*bp)
		numBufPool.Put(bp)
		return written, err
	}
}

// writeInt is equivalent to fmt.Fprint with an int64 argument but uses
// strconv.AppendInt with a byte slice taken from a sync.Pool to avoid