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Added additional convenience overloads to CreateVector().

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Bug: 29337887, 29336299
Change-Id: Iad8b3b2263f6cea7ee7e45994369194960df293b
Tested: on Linux.
This commit is contained in:
Wouter van Oortmerssen
2016-06-15 12:10:01 -07:00
parent bafd48d96c
commit afa276288c
12 changed files with 244 additions and 34 deletions
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55
include/flatbuffers/flatbuffers.h
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@@ -36,16 +36,17 @@
(!defined(_MSC_VER) || _MSC_VER < 1600) && \
(!defined(__GNUC__) || \
(__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ < 40400))
#error A C++11 compatible compiler with support for the auto typing is required for FlatBuffers.
#error A C++11 compatible compiler with support for the auto typing is \
required for FlatBuffers.
#error __cplusplus _MSC_VER __GNUC__ __GNUC_MINOR__ __GNUC_PATCHLEVEL__
#endif
#if !defined(__clang__) && \
defined(__GNUC__) && \
(__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ < 40600)
// Backwards compatability for g++ 4.4, and 4.5 which don't have the nullptr and constexpr
// keywords. Note the __clang__ check is needed, because clang presents itself as an older GNUC
// compiler.
// Backwards compatability for g++ 4.4, and 4.5 which don't have the nullptr
// and constexpr keywords. Note the __clang__ check is needed, because clang
// presents itself as an older GNUC compiler.
#ifndef nullptr_t
const class nullptr_t {
public:
@@ -983,6 +984,33 @@ FLATBUFFERS_FINAL_CLASS
return CreateVector(v.data(), v.size());
}
/// @brief Serialize values returned by a function into a FlatBuffer `vector`.
/// This is a convenience function that takes care of iteration for you.
/// @tparam T The data type of the `std::vector` elements.
/// @param f A function that takes the current iteration 0..vector_size-1 and
/// returns any type that you can construct a FlatBuffers vector out of.
/// @return Returns a typed `Offset` into the serialized data indicating
/// where the vector is stored.
template<typename T> Offset<Vector<T>> CreateVector(size_t vector_size,
const std::function<T (size_t i)> &f) {
std::vector<T> elems(vector_size);
for (size_t i = 0; i < vector_size; i++) elems[i] = f(i);
return CreateVector(elems.data(), elems.size());
}
/// @brief Serialize a `std::vector<std::string>` into a FlatBuffer `vector`.
/// This is a convenience function for a common case.
/// @param v A const reference to the `std::vector` to serialize into the
/// buffer as a `vector`.
/// @return Returns a typed `Offset` into the serialized data indicating
/// where the vector is stored.
Offset<Vector<Offset<String>>> CreateVectorOfStrings(
const std::vector<std::string> &v) {
std::vector<Offset<String>> offsets(v.size());
for (size_t i = 0; i < v.size(); i++) offsets[i] = CreateString(v[i]);
return CreateVector(offsets.data(), offsets.size());
}
/// @brief Serialize an array of structs into a FlatBuffer `vector`.
/// @tparam T The data type of the struct array elements.
/// @param[in] v A pointer to the array of type `T` to serialize into the
@@ -991,7 +1019,7 @@ FLATBUFFERS_FINAL_CLASS
/// @return Returns a typed `Offset` into the serialized data indicating
/// where the vector is stored.
template<typename T> Offset<Vector<const T *>> CreateVectorOfStructs(
const T *v, size_t len) {
const T *v, size_t len) {
StartVector(len * sizeof(T) / AlignOf<T>(), AlignOf<T>());
PushBytes(reinterpret_cast<const uint8_t *>(v), sizeof(T) * len);
return Offset<Vector<const T *>>(EndVector(len));
@@ -1004,7 +1032,7 @@ FLATBUFFERS_FINAL_CLASS
/// @return Returns a typed `Offset` into the serialized data indicating
/// where the vector is stored.
template<typename T> Offset<Vector<const T *>> CreateVectorOfStructs(
const std::vector<T> &v) {
const std::vector<T> &v) {
return CreateVectorOfStructs(v.data(), v.size());
}
@@ -1033,7 +1061,7 @@ FLATBUFFERS_FINAL_CLASS
/// @return Returns a typed `Offset` into the serialized data indicating
/// where the vector is stored.
template<typename T> Offset<Vector<Offset<T>>> CreateVectorOfSortedTables(
Offset<T> *v, size_t len) {
Offset<T> *v, size_t len) {
std::sort(v, v + len, TableKeyComparator<T>(buf_));
return CreateVector(v, len);
}
@@ -1046,7 +1074,7 @@ FLATBUFFERS_FINAL_CLASS
/// @return Returns a typed `Offset` into the serialized data indicating
/// where the vector is stored.
template<typename T> Offset<Vector<Offset<T>>> CreateVectorOfSortedTables(
std::vector<Offset<T>> *v) {
std::vector<Offset<T>> *v) {
return CreateVectorOfSortedTables(v->data(), v->size());
}
@@ -1077,7 +1105,7 @@ FLATBUFFERS_FINAL_CLASS
/// written to at a later time to serialize the data into a `vector`
/// in the buffer.
template<typename T> Offset<Vector<T>> CreateUninitializedVector(
size_t len, T **buf) {
size_t len, T **buf) {
return CreateUninitializedVector(len, sizeof(T),
reinterpret_cast<uint8_t **>(buf));
}
@@ -1162,13 +1190,16 @@ template<typename T> const T *GetRoot(const void *buf) {
}
/// Helpers to get a typed pointer to objects that are currently beeing built.
/// @warning Creating new objects will lead to reallocations and invalidates the pointer!
template<typename T> T *GetMutableTemporaryPointer(FlatBufferBuilder &fbb, Offset<T> offset) {
/// @warning Creating new objects will lead to reallocations and invalidates
/// the pointer!
template<typename T> T *GetMutableTemporaryPointer(FlatBufferBuilder &fbb,
Offset<T> offset) {
return reinterpret_cast<T *>(fbb.GetCurrentBufferPointer() +
fbb.GetSize() - offset.o);
}
template<typename T> const T *GetTemporaryPointer(FlatBufferBuilder &fbb, Offset<T> offset) {
template<typename T> const T *GetTemporaryPointer(FlatBufferBuilder &fbb,
Offset<T> offset) {
return GetMutableTemporaryPointer<T>(fbb, offset);
}