英文:
Golang Preprocessor like C-style compile switch
问题
GO语言有预处理器吗？当我在互联网上查找时，有一些方法可以将*.pgo转换为*.go。而且，我想知道在Go语言中是否可行。
#ifdef COMPILE_OPTION
{编译这段代码...}
#elif
{编译另一段代码...}
或者，
#undef in c
英文:
Does GO language have a preprocessor? When I looked up internet, there was few approaches which *.pgo convert to *.go. And, I wonder if it is doable in Go
#ifdef COMPILE_OPTION
{compile this code ... }
#elif
{compile another code ...}
or,
#undef in c
答案1
得分: 39
最接近实现这一目标的方法是使用构建约束。示例：
main.go
package main
func main() {
println("main()")
conditionalFunction()
}
a.go
// +build COMPILE_OPTION
package main
func conditionalFunction() {
println("conditionalFunction")
}
b.go
// +build !COMPILE_OPTION
package main
func conditionalFunction() {
}
输出：
% go build -o example ; ./example
main()
% go build -o example -tags COMPILE_OPTION ; ./example
main()
conditionalFunction
英文:
The closest way to achieve this is by using build constraints. Example:
main.go
package main
func main() {
println("main()")
conditionalFunction()
}
a.go
// +build COMPILE_OPTION
package main
func conditionalFunction() {
println("conditionalFunction")
}
b.go
// +build !COMPILE_OPTION
package main
func conditionalFunction() {
}
Output:
% go build -o example ; ./example
main()
% go build -o example -tags COMPILE_OPTION ; ./example
main()
conditionalFunction
答案2
得分: 2
潜在地，可以使用Java Comment Preprocessor + maven golang plugin来实现类似的行为，这样的话，Golang代码会像这样：
//#if COMPILE_OPTION
fmt.Println("Ok")
//#else
fmt.Println("No")
//#endif
这里有一些示例放在了这个链接中：https://github.com/raydac/mvn-golang/tree/master/mvn-golang-examples/mvn-golang-examples-preprocessing
英文:
potentially it is possible to use Java Comment Preprocessor + maven golang plugin and get some similar behavior, in the case golang code will look like
//#if COMPILE_OPTION
fmt.Println("Ok")
//#else
fmt.Println("No")
//#endif
some example has been placed here https://github.com/raydac/mvn-golang/tree/master/mvn-golang-examples/mvn-golang-examples-preprocessing
答案3
得分: 2
请注意，可以使用任何宏语言作为Go的预处理器。一个例子是GNU的m4宏语言。
然后，您可以在*.go.m4文件中编写代码，使用构建系统将它们通过m4转换为生成的*.go文件，然后进行编译。
这对于编写泛型代码也很方便。
英文:
Note that it's possible to use any macro language as a preprocessor for go. An example would be GNU's m4 macro language.
You can then write your code in *.go.m4 files, use your build system to feed them through m4 to turn them into generated *.go files, and then compile them.
This can also be handy for writing generics.
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