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use types::{c_char, c_void, size_t, Value};

extern "C" {
    pub fn rb_check_typeddata(object: Value, data_type: *const RbDataType) -> *mut c_void;

    pub fn rb_data_typed_object_wrap(klass: Value,
                                     data: *mut c_void,
                                     data_type: *const RbDataType)
                                     -> Value;
}

#[repr(C)]
pub struct RbDataTypeFunction {
    pub dmark: Option<extern "C" fn(*mut c_void)>,
    pub dfree: Option<extern "C" fn(*mut c_void)>,
    pub dsize: Option<extern "C" fn(*const c_void) -> size_t>,
    pub reserved: [*mut c_void; 2],
}

#[repr(C)]
pub struct RbDataType {
    pub wrap_struct_name: *const c_char,
    pub function: RbDataTypeFunction,
    pub parent: *const RbDataType,
    pub data: *mut c_void,
    pub flags: Value,
}