On Thu, Feb 15, 2018 at 8:41 AM, junije wen <junjiew...@gmail.com> 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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