internal/strbld/strbld_old.go

// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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.

// +build !go1.10

package strbld

import (
	"bytes"
	"unsafe"
)

// Builder provides support to construct a string using Write methods.
// It minimizes memory copying.
type Builder struct {
	buf bytes.Buffer
}

// String returns the buffered contents as string.
func (b *Builder) String() string {
	buf := b.buf.Bytes()
	return *(*string)(unsafe.Pointer(&buf))
}

// Reset clears the buffer. The buffer for a new string will not be shared with
// the original strings buffer.
func (b *Builder) Reset() {
	// clear buffer, strings must not be potentially overwritten after reset
	b.buf = bytes.Buffer{}
}