Re: [protobuf] Copy protobuf message
Thanks @Bo.
On Wednesday, April 4, 2018 at 1:45:01 PM UTC-7, Bo Yang wrote:
>
> Given that the enum in B is a superset of A. I don't think you need to
> adjust any enum value.
>
> On Wed, Apr 4, 2018 at 12:38 PM Shyam S R >
> wrote:
>
>> Thanks @Bo for the comments-
>>
>> I fixed the message for clarify and for reference:
>>
>> message A {
>>enum foo {
>> value1 = 0;
>> value2 = 1;
>>}
>>int32 id = 1;
>>string name = 2;
>>foo type = 3;
>>optional NestedMsg1 msg = 4;
>> }
>>
>> message NestedMsg1 {
>>int32 id = 1;
>>string name = 2;
>> }
>>
>>
>> message B {
>>enum foo {
>> value0 = 0;
>> value1 = 1;
>> value2 =2;
>>}
>>int32 id = 1;
>>string name = 2;
>>foo type = 3;
>>optional NestedMsg2 msg = 4;
>> }
>>
>> message NestedMsg2 {
>>int32 id = 1;
>>string name = 2;
>> }
>>
>> Given such a schema, i understand that it should be feasible to copy from
>> type A to B through:
>> void copy(A &in, B &out) {
>>out.ParseFromString(in.SerializeToString());
>>return;
>> }
>>
>> The enum value in out may have to be adjusted though i believe-
>>
>> Thanks,
>> Shyam
>>
>> On Wednesday, April 4, 2018 at 9:59:36 AM UTC-7, Bo Yang wrote:
>>
>>> 1) You misunderstood the enum definition in proto. field1, field2 and
>>> field3 don't define fields on message A and B. Instead, they define the
>>> enum value of enum foo.
>>> 2) If the nested message field have the same structure and same field
>>> number, it will still work.
>>> BTW, I just find your proto definition is not valid. Please take a look
>>> of the example, see how a valid proto looks like.
>>>
>>> On Wed, Apr 4, 2018 at 9:46 AM Shyam S R wrote:
>>>
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 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 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!
--
You received this message because you are subscribed to the Google
Groups "Protocol Buffers" group.
>>
Re: [protobuf] Copy protobuf message
Given that the enum in B is a superset of A. I don't think you need to
adjust any enum value.
On Wed, Apr 4, 2018 at 12:38 PM Shyam S R wrote:
> Thanks @Bo for the comments-
>
> I fixed the message for clarify and for reference:
>
> message A {
>enum foo {
> value1 = 0;
> value2 = 1;
>}
>int32 id = 1;
>string name = 2;
>foo type = 3;
>optional NestedMsg1 msg = 4;
> }
>
> message NestedMsg1 {
>int32 id = 1;
>string name = 2;
> }
>
>
> message B {
>enum foo {
> value0 = 0;
> value1 = 1;
> value2 =2;
>}
>int32 id = 1;
>string name = 2;
>foo type = 3;
>optional NestedMsg2 msg = 4;
> }
>
> message NestedMsg2 {
>int32 id = 1;
>string name = 2;
> }
>
> Given such a schema, i understand that it should be feasible to copy from
> type A to B through:
> void copy(A &in, B &out) {
>out.ParseFromString(in.SerializeToString());
>return;
> }
>
> The enum value in out may have to be adjusted though i believe-
>
> Thanks,
> Shyam
>
> On Wednesday, April 4, 2018 at 9:59:36 AM UTC-7, Bo Yang wrote:
>
>> 1) You misunderstood the enum definition in proto. field1, field2 and
>> field3 don't define fields on message A and B. Instead, they define the
>> enum value of enum foo.
>> 2) If the nested message field have the same structure and same field
>> number, it will still work.
>> BTW, I just find your proto definition is not valid. Please take a look
>> of the example, see how a valid proto looks like.
>>
>> On Wed, Apr 4, 2018 at 9:46 AM Shyam S R wrote:
>>
>>> 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 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 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!
>>>
>>> --
>>> You received this message because you are subscribed to the Google
>>> Groups "Protocol Buffers" group.
>>>
>> To unsubscribe from this group and stop receiving emails from it,
>>> send an email to protobuf+u...@googlegroups.com.
>>> To post to this group, send email to prot...@googlegroups.com.
>>
>>
>>> Visit this group at https://groups.google.com/group/protobuf.
>>> For more options, vi
Re: [protobuf] Copy protobuf message
Thanks @Bo for the comments-
I fixed the message for clarify and for reference:
message A {
enum foo {
value1 = 0;
value2 = 1;
}
int32 id = 1;
string name = 2;
foo type = 3;
optional NestedMsg1 msg = 4;
}
message NestedMsg1 {
int32 id = 1;
string name = 2;
}
message B {
enum foo {
value0 = 0;
value1 = 1;
value2 =2;
}
int32 id = 1;
string name = 2;
foo type = 3;
optional NestedMsg2 msg = 4;
}
message NestedMsg2 {
int32 id = 1;
string name = 2;
}
Given such a schema, i understand that it should be feasible to copy from
type A to B through:
void copy(A &in, B &out) {
out.ParseFromString(in.SerializeToString());
return;
}
The enum value in out may have to be adjusted though i believe-
Thanks,
Shyam
On Wednesday, April 4, 2018 at 9:59:36 AM UTC-7, Bo Yang wrote:
>
> 1) You misunderstood the enum definition in proto. field1, field2 and
> field3 don't define fields on message A and B. Instead, they define the
> enum value of enum foo.
> 2) If the nested message field have the same structure and same field
> number, it will still work.
> BTW, I just find your proto definition is not valid. Please take a look of
> the example, see how a valid proto looks like.
>
> On Wed, Apr 4, 2018 at 9:46 AM Shyam S R >
> wrote:
>
>> 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 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 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!
>>
>> --
>> You received this message because you are subscribed to the Google
>> Groups "Protocol Buffers" group.
>>
> To unsubscribe from this group and stop receiving emails from it, send
>> an email to protobuf+u...@googlegroups.com.
>> To post to this group, send email to prot...@googlegroups.com.
>
>
>> Visit this group at https://groups.google.com/group/protobuf.
>> For more options, visit https://groups.google.com/d/optout.
>>
> --
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Re: [protobuf] Copy protobuf message
Thanks @Bo for the comments-
I fixed the message for clarify and for reference:
message A {
enum foo {
value1 = 0;
value2 = 1;
}
int32 id;
string name;
foo type;
optional NestedMsg1 msg;
}
message NestedMsg1 {
int32 id;
string name;
}
message B {
enum foo {
value0 = 0;
value1 = 1;
value2 =2;
}
int32 id;
string name;
foo type;
optional NestedMsg2 msg;
}
message NestedMsg2 {
int32 id;
string name;
}
Given such a schema, i understand that it should be feasible to copy from
type A to B through:
void copy(A &in, B &out) {
out.ParseFromString(in.SerializeToString());
return;
}
The enum value in out may have to be adjusted though i believe-
Thanks,
Shyam
On Wednesday, April 4, 2018 at 9:59:36 AM UTC-7, Bo Yang wrote:
>
> 1) You misunderstood the enum definition in proto. field1, field2 and
> field3 don't define fields on message A and B. Instead, they define the
> enum value of enum foo.
> 2) If the nested message field have the same structure and same field
> number, it will still work.
> BTW, I just find your proto definition is not valid. Please take a look of
> the example, see how a valid proto looks like.
>
> On Wed, Apr 4, 2018 at 9:46 AM Shyam S R >
> wrote:
>
>> 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 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 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!
>>
>> --
>> You received this message because you are subscribed to the Google
>> Groups "Protocol Buffers" group.
>>
> To unsubscribe from this group and stop receiving emails from it, send
>> an email to protobuf+u...@googlegroups.com.
>> To post to this group, send email to prot...@googlegroups.com.
>
>
>> Visit this group at https://groups.google.com/group/protobuf.
>> For more options, visit https://groups.google.com/d/optout.
>>
> --
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Visit this gro
Re: [protobuf] Copy protobuf message
1) You misunderstood the enum definition in proto. field1, field2 and
field3 don't define fields on message A and B. Instead, they define the
enum value of enum foo.
2) If the nested message field have the same structure and same field
number, it will still work.
BTW, I just find your proto definition is not valid. Please take a look of
the example, see how a valid proto looks like.
On Wed, Apr 4, 2018 at 9:46 AM Shyam S R wrote:
> 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 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 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!
>
> --
> You received this message because you are subscribed to the Google
> Groups "Protocol Buffers" group.
>
To unsubscribe from this group and stop receiving emails from it, send
> an email to protobuf+u...@googlegroups.com.
> To post to this group, send email to prot...@googlegroups.com.
> Visit this group at https://groups.google.com/group/protobuf.
> For more options, visit https://groups.google.com/d/optout.
>
--
>>> You received this message because you are subscribed to the Google
>>> Groups "Protocol Buffers" group.
>>> To unsubscribe from this group and stop receiving emails from it, send
>>> an email to protobuf+u...@googlegroups.com.
>>> To post to this group, send email to prot...@googlegroups.com.
>>> Visit this group at https://groups.google.com/group/protobuf.
>>> For more options, visit https://groups.google.com/d/optout.
>>>
>> --
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>
--
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Re: [protobuf] Copy protobuf message
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 >
> 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 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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Re: [protobuf] Copy protobuf message
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 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 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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>>> Groups "Protocol Buffers" group.
>>>
>> To unsubscribe from this group and stop receiving emails from it, send an
>>> email to protobuf+u...@googlegroups.com.
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>>
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>>>
>> --
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Re: [protobuf] Copy protobuf message
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 >
> 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!
>>
>> --
>> You received this message because you are subscribed to the Google Groups
>> "Protocol Buffers" group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to protobuf+u...@googlegroups.com .
>> To post to this group, send email to prot...@googlegroups.com
>> .
>> Visit this group at https://groups.google.com/group/protobuf.
>> For more options, visit https://groups.google.com/d/optout.
>>
>
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Re: [protobuf] Copy protobuf message
The second copy looks correct to me.
On Tue, Apr 3, 2018 at 5:26 PM Shyam S R 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!
>
> --
> You received this message because you are subscribed to the Google Groups
> "Protocol Buffers" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to protobuf+unsubscr...@googlegroups.com.
> To post to this group, send email to protobuf@googlegroups.com.
> Visit this group at https://groups.google.com/group/protobuf.
> For more options, visit https://groups.google.com/d/optout.
>
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