加载时显示ruby文件的完整路径名(Show full path name of the ruby file when it get loaded)

 Go 1.5增加了对构建可从C调用的共享库的支持（从而通过FFI从Ruby）。 这使得该过程比1.5版之前的版本（当需要编写C glue层时更容易）以及Go运行时现在可用，使其在现实生活中非常有用（以前不可能使用goroutine和内存分配，因为他们需要Go运行时，如果Go不是主要入口点，那么这是不可用的）。 
 
 goFuncs.go： 
 
package main

import "C"

//export GoAdd
func GoAdd(a, b C.int) C.int {
    return a + b
}

func main() {} // Required but ignored
 
 请注意， //export GoAdd注释是每个导出的函数所必需的; export后的符号是函数如何导出。 
 
 goFromRuby.rb： 
 
require 'ffi'

module GoFuncs
  extend FFI::Library
  ffi_lib './goFuncs.so'
  attach_function :GoAdd, [:int, :int], :int
end

puts GoFuncs.GoAdd(41, 1)
 
 该图书馆建有： 
 
go build -buildmode=c-shared -o goFuncs.so goFuncs.go
 
 运行Ruby脚本会产生： 
 
42

Go 1.5 added support for building shared libraries that are callable from C (and thus from Ruby via FFI). This makes the process easier than in pre-1.5 releases (when it was necessary to write the C glue layer), and the Go runtime is now usable, making this actually useful in real life (goroutines and memory allocations were not possible before, as they require the Go runtime, which was not useable if Go was not the main entry point).
 
goFuncs.go:
 
package main

import "C"

//export GoAdd
func GoAdd(a, b C.int) C.int {
    return a + b
}

func main() {} // Required but ignored
 
Note that the //export GoAdd comment is required for each exported function; the symbol after export is how the function will be exported.
 
goFromRuby.rb:
 
require 'ffi'

module GoFuncs
  extend FFI::Library
  ffi_lib './goFuncs.so'
  attach_function :GoAdd, [:int, :int], :int
end

puts GoFuncs.GoAdd(41, 1)
 
The library is built with:
 
go build -buildmode=c-shared -o goFuncs.so goFuncs.go
 
Running the Ruby script produces:
 
42