'Keith Randall' via golang-nuts <golang-nuts@googlegroups.com> schrieb am
Di., 18. Mai 2021, 18:25:
> You can use a function call to do the cast:
>
> func byteErr2stringErr(b []byte, e error) (string, error) {
> return string(b), e
> }
> content, err := byteErr2stringErr(os.ReadFile(path))
>
> It's still using additional variables, but they are hidden inside the
> helper function.
> On Sunday, May 16, 2021 at 8:07:24 PM UTC-7 Kurtis Rader wrote:
>
>> On Sun, May 16, 2021 at 7:49 PM 'Marc Michael' via golang-nuts <
>> golan...@googlegroups.com> wrote:
>>
>>> as Go provides multi values I would expect that's possible to cast such
>>> a multi value. Do I see it correctly, that Go does not provide it?
>>>
>>> Example:
>>>
>>> os.ReadFile returns []byte, error.
>>> I want to cast the []byte to a string.
>>>
>>> content, err := os.ReadFile(path)
>>>
>>> Is it possible to cast the []byte directly to a string without using a
>>> second variable?
>>>
>>
>> No, it is not possible to transform the type of one return value in a
>> multi-valued
>> expression such as a function call. Such syntactic sugar would have limited
>> usefulness and, in my opinion, is likely to decrease readability and thus
>> be a source of bugs. If you find yourself needing to perform such
>> conversions so often that such a feature is useful that suggests the APIs
>> you're using need to be changed.
>>
>
Hello,
thanks for the clarification. I have thought that I had something overseen.
I have thought about introducing a second variable of type string, but this
would lead to doubling of the memory usage, especaly as I don't now really
how much data there is. With the additional function I think this would not
a real problem, as the []byte would go away if the additional function
finishes.
Thanks all for your help. :-)
Kindly regards
>
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