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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);
typdef struct {
uint16_t slab_index, array_index;
} kpl_ptr;
#define KPL_PTR_NULL (kpl_ptr) { .slab_index = UINT16_MAX, .array_index = UINT16_MAX }
```
## `kpl_interface`
See [Operators](../language/operators.md)
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