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Make the Model/Repeater type safe in C++

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This commit is contained in:
Olivier Goffart 2020-09-04 19:02:56 +02:00
parent 4c07fbfb3d
commit f6c8ea0f20
3 changed files with 58 additions and 48 deletions
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16
api/sixtyfps-cpp/include/sixtyfps.h
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@ -182,6 +182,7 @@ using cbindgen_private::solve_path_layout;
// models
template<typename ModelData>
struct Model
{
virtual ~Model() = default;
@ -189,37 +190,36 @@ struct Model
Model(const Model &) = delete;
Model &operator=(const Model &) = delete;
virtual int count() const = 0;
virtual const void *get(int i) const = 0;
virtual const ModelData get(int i) const = 0;
};
template<int Count, typename ModelData>
struct ArrayModel : Model
struct ArrayModel : Model<ModelData>
{
std::array<ModelData, Count> data;
template<typename... A>
ArrayModel(A &&... a) : data { std::forward<A>(a)... }
{
}
ArrayModel(int x) { }
int count() const override { return Count; }
const void *get(int i) const override { return &data[i]; }
const ModelData get(int i) const override { return data[i]; }
};
struct IntModel : Model
struct IntModel : Model<int>
{
IntModel(int d) : data(d) { }
int data;
int count() const override { return data; }
const void *get(int) const override { return &data; }
const int get(int value) const override { return value; }
};
template<typename C>
template<typename C, typename ModelData>
struct Repeater
{
std::vector<std::unique_ptr<C>> data;
template<typename Parent>
void update_model(Model *model, const Parent *parent) const
void update_model(Model<ModelData> *model, const Parent *parent) const
{
auto &data = const_cast<Repeater *>(this)->data;
data.clear();