Julia showerror用法及代碼示例

showerror(io, e)

顯示異常對象 e 的說明性表示。此方法用於在調用 throw 後顯示異常。

例子

julia> struct MyException <: Exception
           msg::String
       end

julia> function Base.showerror(io::IO, err::MyException)
           print(io, "MyException: ")
           print(io, err.msg)
       end

julia> err = MyException("test exception")
MyException("test exception")

julia> sprint(showerror, err)
"MyException: test exception"

julia> throw(MyException("test exception"))
ERROR: MyException: test exception