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#pragma once
#include <google/protobuf/descriptor.h>
namespace NProtoBuf {
class TFieldsIterator {
public:
explicit TFieldsIterator(const NProtoBuf::Descriptor* descriptor, int position = 0)
: Descriptor(descriptor)
, Position(position)
{ }
TFieldsIterator& operator++() {
++Position;
return *this;
}
TFieldsIterator& operator++(int) {
auto& ret = *this;
++*this;
return ret;
}
const NProtoBuf::FieldDescriptor* operator*() const {
return Descriptor->field(Position);
}
bool operator== (const TFieldsIterator& other) const {
return Position == other.Position && Descriptor == other.Descriptor;
}
bool operator!= (const TFieldsIterator& other) const {
return !(*this == other);
}
private:
const NProtoBuf::Descriptor* Descriptor = nullptr;
int Position = 0;
};
}
// Namespaces required by `range-based for` ADL:
namespace google {
namespace protobuf {
NProtoBuf::TFieldsIterator begin(const NProtoBuf::Descriptor& descriptor) {
return NProtoBuf::TFieldsIterator(&descriptor);
}
NProtoBuf::TFieldsIterator end(const NProtoBuf::Descriptor& descriptor) {
return NProtoBuf::TFieldsIterator(&descriptor, descriptor.field_count());
}
}
}
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