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Add a VectorCast function that safely casts from 

Vector<Offset<T>> to Vector<Offset<U>> if U is a base
class of T.

This is useful for when you want to generically
iterate over a vector of objects that derive from
flatbuffers::Table.

Change-Id: I59161e3b9f40501f72e02b46509be9dc8ab86c6b
This commit is contained in:
Wouter van Oortmerssen 2017-03-27 17:46:34 -07:00
parent 7a36419f24
commit 89041a1686
1 changed files with 14 additions and 0 deletions
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14
include/flatbuffers/flatbuffers.h
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@ -483,6 +483,20 @@ private:
VectorOfAny(const VectorOfAny&); VectorOfAny(const VectorOfAny&);
}; };
#ifndef FLATBUFFERS_CPP98_STL
template<typename T, typename U>
Vector<Offset<T>> *VectorCast(Vector<Offset<U>> *ptr) {
static_assert(std::is_base_of<T, U>::value, "Unrelated types");
return reinterpret_cast<Vector<Offset<T>> *>(ptr);
}
template<typename T, typename U>
const Vector<Offset<T>> *VectorCast(const Vector<Offset<U>> *ptr) {
static_assert(std::is_base_of<T, U>::value, "Unrelated types");
return reinterpret_cast<const Vector<Offset<T>> *>(ptr);
}
#endif
// Convenient helper function to get the length of any vector, regardless // Convenient helper function to get the length of any vector, regardless
// of wether it is null or not (the field is not set). // of wether it is null or not (the field is not set).
template<typename T> static inline size_t VectorLength(const Vector<T> *v) { template<typename T> static inline size_t VectorLength(const Vector<T> *v) {