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Add arbitrary string type to the native object API (#4218)

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* Custom strings are very common for optimizations around small objects
  or growth style optimizations, i.e.: grow at 1.57 times vs doubling vs..

  A second common strategy is to cooperate w/ the memory allocator
  see FBString[1] and seastar[2] string for examples.

[1] fbstring: https://github.com/facebook/folly/blob/master/folly/docs/FBString.md
[2] sstring: https://github.com/scylladb/seastar/blob/master/core/sstring.hh
This commit is contained in:
Alexander Gallego
2017-03-20 19:02:04 -04:00
committed by Wouter van Oortmerssen
parent 9c25ecdcd1
commit f2071e4f80
5 changed files with 35 additions and 2 deletions
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9
include/flatbuffers/flatbuffers.h
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@@ -980,6 +980,15 @@ FLATBUFFERS_FINAL_CLASS
return str ? CreateString(str->c_str(), str->Length()) : 0;
}
/// @brief Store a string in the buffer, which can contain any binary data.
/// @param[in] str A const reference to a std::string like type with support
/// of T::c_str() and T::length() to store in the buffer.
/// @return Returns the offset in the buffer where the string starts.
template<typename T>
Offset<String> CreateString(const T &str) {
return CreateString(str.c_str(), str.length());
}
/// @brief Store a string in the buffer, which can contain any binary data.
/// If a string with this exact contents has already been serialized before,
/// instead simply returns the offset of the existing string.

3
include/flatbuffers/idl.h
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@@ -353,6 +353,7 @@ struct IDLOptions {
bool escape_proto_identifiers;
bool generate_object_based_api;
std::string cpp_object_api_pointer_type;
std::string cpp_object_api_string_type;
bool union_value_namespacing;
bool allow_non_utf8;
std::string include_prefix;
@@ -479,6 +480,7 @@ class Parser : public ParserState {
known_attributes_["idempotent"] = true;
known_attributes_["cpp_type"] = true;
known_attributes_["cpp_ptr_type"] = true;
known_attributes_["cpp_str_type"] = true;
known_attributes_["native_inline"] = true;
known_attributes_["native_type"] = true;
known_attributes_["native_default"] = true;
@@ -743,4 +745,3 @@ bool GenerateGoGRPC(const Parser &parser,
} // namespace flatbuffers
#endif // FLATBUFFERS_IDL_H_