Thanks for your fast response very much!
It really helps.
在 2018年2月15日星期四 UTC-6上午10:01:09，Burak Serdar写道：
>
> On Thu, Feb 15, 2018 at 8:41 AM, junije wen <junji...@gmail.com
> <javascript:>> wrote:
> > I'm reading the source code of Iris and trying to reimplement it.
> > There is a line I can't understand.
> >
> > if p, is := e.Engine.(EngineRawExecutor); is {
> > return p.ExecuteRaw(src, wr, binding)
> > }
> >
> > The define of EngineRawExecutor is
> >
> > EngineRawExecutor interface {
> > // ExecuteRaw is super-simple function without options and funcs,
> it's
> > not used widely
> > ExecuteRaw(src string, wr io.Writer, binding interface{}) error
> >
> > }
> >
> > I'm pretty curious about how e.Engine.(EngineRawExecutor) works, what is
> the
> > parentheses means there.
>
> It is a type assertion: https://tour.golang.org/methods/15
>
> p, is:=e.Engine.(EngineRawExecutor)
>
> 'is' will be true if e.Engine can be converted to an
> EngineRawExecutor, and p will be a variable of type EngineRawExecutor.
>
>
> >
> > why this line return two return value p, and is
> >
> > I'm confused, any help will be great to me.
> >
> > Thanks
> >
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