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 <sr.s...@gmail.com <javascript:>>
> 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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