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# Interface

---

General definitions used throughout the code

## Object Definitions

```c
typedef union {
    bool b;
    uint8_t u8;
    uint16_t u16;
    uint32_t u32;
    uint64_t u64;
    int8_t i8;
    int16_t i16;
    int32_t i32;
    int64_t i64;
    float f32;
    double f64;
    void *ptr;
} kpl_any;

typedef void kpl_interface_free(kpl_any a);

typedef struct {
    // TODO
} kpl_interface;

typedef struct {
    kpl_any *any;
    kpl_interface *interface;
} kpl_class;

typedef enum : uint8_t {
    KPL_STATUS_ERROR,
    KPL_STATUS_NULL,
    KPL_STATUS_VALUE
} kpl_result_status;

typedef struct {
    any value;
    kpl_result_status status;
} kpl_result;

kpl_result kpl_result_error(error *er);

kpl_result kpl_result_null(void);

kpl_result kpl_result_value(any value);
```

## `kpl_interface`

See [Operators](../language/operators.md)