Supported types - YAL-GameMaker-Tools/GmlCppExtFuncs GitHub Wiki

The following are handled by the tool:

• bool <-> buffer_bool
• char, int8_t <-> buffer_s8
• unsigned char, byte, uint8_t <-> buffer_u8
• short, int16_t <-> buffer_s16
• unsigned short, uint16_t <-> buffer_u16
• int, int32_t <-> buffer_s32
• unsigned int, uint32_t <-> buffer_u32
• long long, int64_t <-> buffer_u64
• unsigned long long, uint64_t <-> buffer_u64
• float <-> buffer_f32
• double <-> buffer_f64
• struct <-> array or (2.3+) struct
  See --struct; supports nested structures and arrays;
  Arrays of characters are converted to GML strings.
• const char* <-> string
  (note: can only be argument/return types - if you need a string in a struct, use char str[len])
• std::vector<T><->array<T> (note: vectors cannot currently be nested inside other vectors or structs)
• std::tuple<...><->array
  Tuple values are unpacked
• gml_vector<T><->array<T> Like vector, but points at data right in the GML buffer instead of making a copy.
• std::optional<T><->T or undefined
  Can be used to accept/return a value-type or GML undefined.
  Currently can only be used on argument/return types - no optional values inside structs/arrays.

The tool will resolve any typedefs so long as they are in the files to be processed or indexed (--index)