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[vector] Allow to iterate with mutables (#7586)

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Co-authored-by: ArnaudD-FR <arnaud.desmier@gmail.com>
Co-authored-by: Derek Bailey <derekbailey@google.com>
This commit is contained in:
ArnaudD-FR
2022-10-21 21:10:18 +02:00
committed by GitHub
parent 872a497464
commit 5b3fadcc16
4 changed files with 30 additions and 6 deletions
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12
include/flatbuffers/vector.h
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@@ -27,14 +27,15 @@ struct String;
// An STL compatible iterator implementation for Vector below, effectively
// calling Get() for every element.
template<typename T, typename IT> struct VectorIterator {
template<typename T, typename IT, typename Data = uint8_t *>
struct VectorIterator {
typedef std::random_access_iterator_tag iterator_category;
typedef IT value_type;
typedef ptrdiff_t difference_type;
typedef IT *pointer;
typedef IT &reference;
VectorIterator(const uint8_t *data, uoffset_t i)
VectorIterator(Data data, uoffset_t i)
: data_(data + IndirectHelper<T>::element_stride * i) {}
VectorIterator(const VectorIterator &other) : data_(other.data_) {}
VectorIterator() : data_(nullptr) {}
@@ -116,9 +117,12 @@ template<typename T, typename IT> struct VectorIterator {
}
private:
const uint8_t *data_;
Data data_;
};
template<typename T, typename IT>
using VectorConstIterator = VectorIterator<T, IT, const uint8_t *>;
template<typename Iterator>
struct VectorReverseIterator : public std::reverse_iterator<Iterator> {
explicit VectorReverseIterator(Iterator iter)
@@ -145,7 +149,7 @@ template<typename T> class Vector {
public:
typedef VectorIterator<T, typename IndirectHelper<T>::mutable_return_type>
iterator;
typedef VectorIterator<T, typename IndirectHelper<T>::return_type>
typedef VectorConstIterator<T, typename IndirectHelper<T>::return_type>
const_iterator;
typedef VectorReverseIterator<iterator> reverse_iterator;
typedef VectorReverseIterator<const_iterator> const_reverse_iterator;