// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package zlib
....
// A Writer takes data written to it and writes the compressed
// form of that data to an underlying writer (see NewWriter).
type Writer struct {
w io.Writer
level int
dict []byte
compressor * flate.Writer
digest hash.Hash32
err error
scratch [4]byte
wroteHeader bool
}
// NewWriter creates a new Writer.
// Writes to the returned Writer are compressed and written to w.
//
// It is the caller's responsibility to call Close on the WriteCloser when done.
// Writes may be buffered and not flushed until Close.
func NewWriter(w io.Writer) * Writer {
z, _ := NewWriterLevelDict(w, DefaultCompression, nil)
return z
}
命令行下进入目录下并输入命令： godoc -http=:6060 -goroot="."
8.3 Go程序的编译
在Go语言中，和编译有关的命令主要是go run ,go build , go install这三个命令。
go run只能作用于main包文件，先运行compile 命令编译生成.a文件，然后 link 生成最终可执行文件并运行程序，这过程的产生的是临时文件，在go run 退出前会删除这些临时文件（含.a文件和可执行文件）。最后直接在命令行输出程序执行结果。go run 命令在第二次执行的时候，如果发现导入的代码包没有发生变化，那么 go run 不会再次编译这个导入的代码包，直接进行链接生成最终可执行文件并运行程序。
go install用于编译并安装指定的代码包及它们的依赖包，并且将编译后生成的可执行文件放到 bin 目录下（GOPATH/bin），编译后的包文件放到当前工作区的 pkg 的平台相关目录下。
go build用于编译指定的代码包以及它们的依赖包。如果用来编译非main包的源码，则只做检查性的编译，而不会输出任何结果文件。如果是一个可执行程序的源码（即是 main 包），这个过程与go run 大体相同，除了会在当前目录生成一个可执行文件外。
运行命令，go help mod ，我们可以看到mod的操作子命令，主要是init、 edit、 tidy。
Go mod provides access to operations on modules.
Note that support for modules is built into all the go commands,
not just 'go mod'. For example, day-to-day adding, removing, upgrading,
and downgrading of dependencies should be done using 'go get'.
See 'go help modules' for an overview of module functionality.
Usage:
go mod <command> [arguments]
The commands are:
download download modules to local cache
edit edit go.mod from tools or scripts
graph print module requirement graph
init initialize new module in current directory
tidy add missing and remove unused modules
vendor make vendored copy of dependencies
verify verify dependencies have expected content
why explain why packages or modules are needed
Use "go help mod <command>" for more information about a command.
