Here is some example code you could play with:
#include "test.pb.h"
int main(int args, const char **arg)
{
Message1 m1;
m1.set_a("22");
m1.set_b("33");
WrapperMessage wm1;
wm1.set_allocated_m1(&m1);
auto s = wm1.SerializeAsString();
WrapperMessage wm2;
wm2.ParseFromString(s);
if (wm2.has_m1())
{
auto msg1 = wm2.m1();
auto msg1a = msg1.a();
auto msg1b = msg1.b();
}
return 0;
}
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