go语言的init函数详解(2)-木庄网络博客

2021-10-25 13:38:53 php中文网 Go 百度已收录

编译之后执行gprog.exe后的结果表明，gprog.go中的init函数先执行，然后执行了ginit1.go中的两个init函数，然后才执行main函数。

E:\opensource\go\prj\hellogo>gprog.exe
do in init
do in init1
do in init2
do in main

注：《the way to go》中(P70)有下面红色一句描述，意思是说一个go源文件只能有一个init函数，

但是上面的ginit1.go中的两个init函数编译运行后都正常执行了，

因此这句话应该是笔误。

4.4.5 Init-functions
Apart from global declaration with initialization, variables can also be initialized in an init()-function.
This is a special function with the name init() which cannot be called, but is executed automatically
before the main() function in package main or at the start of the import of the package that
contains it.
Every source file can contain only 1 init()-function. Initialization is always single-threaded and
package dependency guarantees correct execution order.