By source values i meant the values of enums in "in" message: void copy(A
&in, B &out). The enum values in A and B differ by one element.
By nested messages,
message A {
enum foo {
field1 = 0;
field2 = 1;
}
int32 id;
string name;
foo type;
NestedMsg1 msg1;
}
message NestedMsg1 {
int32 id;
string name;
}
If message B were to also have a similar structure, will
out.ParseFromString(in.SerializeToString()) take care of nested messages as
well ?
I also explore CopyFrom(Message&) but not sure if it will work-
Thanks,
Shyam
On Wednesday, April 4, 2018 at 9:37:38 AM UTC-7, Bo Yang wrote:
>
> I don't quite follow your question.
> What's the source values and nested messages you are referring to ?
>
> On Tue, Apr 3, 2018 at 5:52 PM Shyam S R <[email protected] <javascript:>>
> wrote:
>
>> thanks for the reply @Bo. Follow up: What happens to the enums, the
>> source values are maintained i suppose ?
>>
>> Does it work with nested messages also, in the sense, does
>> ParseFromString look for any message type information within the stream or
>> as long as the scalar types are good it parses ok ?
>>
>> On Tuesday, April 3, 2018 at 5:42:26 PM UTC-7, Bo Yang wrote:
>>
>>> The second copy looks correct to me.
>>>
>>> On Tue, Apr 3, 2018 at 5:26 PM Shyam S R <[email protected]> wrote:
>>>
>> Hi all,
>>>>
>>>> Is there a favored way to copy a protobuf message from one type to
>>>> another ? A little background:
>>>>
>>>> I have two messages for example:
>>>> message A {
>>>> enum foo {
>>>> field1 = 0;
>>>> field2 = 1;
>>>> }
>>>> int32 id;
>>>> string name;
>>>> foo type;
>>>> }
>>>>
>>>> message B {
>>>> enum foo {
>>>> field1 = 0;
>>>> field2 = 1;
>>>> field3 =2;
>>>> }
>>>> int32 id;
>>>> string name;
>>>> foo type;
>>>> }
>>>>
>>>> I have references to these messages and want to implement this method:
>>>> void copy(A &in, B &out) {
>>>> // in's contents need to be copied to out
>>>> }
>>>>
>>>> the only difference between A and B is the enum field and they are
>>>> named different. There could be more messages within the message types A
>>>> and B with the same fields, but only enum's having an extra field in B.
>>>> How
>>>> should i go about this ?
>>>>
>>>> Do the following options look feasible :
>>>> void copy(A &in, B &out) {
>>>> // in's contents need to be copied to out
>>>> cast in to type B
>>>> out = in;
>>>> }
>>>>
>>>> void copy(A &in, B &out) {
>>>> // in's contents need to be copied to out
>>>> Use in.SerializeAsString() and pipe it to out.ParseFromString()
>>>> }
>>>>
>>>> Appreciate the community's help!
>>>>
>>>> Thanks!
>>>>
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