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Reading key and value from a map field in protobuf message using c++ API call

I have a proto3 file. There is a message in the proto file that contains a map field.

message abc
map mapfield = 1;
Suppose as a c++ consumer i want to read this map field, what would be the api call necessary for me to read these key and value from this map field into a string and int field in c++ ?

I tried to look for it here : but could not find how the code on how to consume the map fields. Can someone help me with it ?

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