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More native code gen functionality.

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Allow tables to be mapped to native types directly.  For example, a table
representing a vector3 (eg. table Vec3 { x:float; y:float; z:float; }) can
be mapped to a "mathfu::vec3" native type in NativeTables.  This requires
users to provide Pack and UnPack functions that convert between the
Table and native types.  This is done by adding the "native_type" attribute
to the table definition.

To support user-defined flatbuffers::Pack and flatbuffers::UnPack functions,
support a "native_include" markup that will generate a corresponding

Also add an UnPackTo function which allows users to pass in a pointer to
a NativeTable object into which to UnPack the Table.  The existing UnPack
function is now simply:

  NativeTable* UnPack() {
    NativeTable* obj = new NativeTable();
    Table::UnPackTo(obj);
    return obj;
  }

Finally, allow native types to be given a default value as well which are
set in the NativeTable constructor.  This is done by providing a
"native_default" attribute to the member of a table.

Change-Id: Ic45cb48b0e6d7cfa5734b24819e54aa96d847cfd
This commit is contained in:
Wouter van Oortmerssen
2017-01-18 16:23:35 -08:00
parent 42a265b419
commit 3f936c5655
7 changed files with 318 additions and 90 deletions
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3
include/flatbuffers/idl.h
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@@ -459,6 +459,8 @@ class Parser : public ParserState {
known_attributes_["cpp_type"] = true;
known_attributes_["cpp_ptr_type"] = true;
known_attributes_["native_inline"] = true;
known_attributes_["native_type"] = true;
known_attributes_["native_default"] = true;
}
~Parser() {
@@ -573,6 +575,7 @@ private:
std::map<std::string, bool> included_files_;
std::map<std::string, std::set<std::string>> files_included_per_file_;
std::vector<std::string> native_included_files_;
std::map<std::string, bool> known_attributes_;