#ifndef _SLICE_H_
#define _SLICE_H_

#include <assert.h>
#include <stddef.h>

#define DEFINE_SLICE(t)                                                \
	typedef struct {                                               \
		size_t size;                                           \
		t *buf;                                                \
	} t##_slice;                                                   \
	                                                               \
	static inline t##_slice                                        \
	t##_slice2(t##_slice slice, size_t i, size_t j)                \
	{                                                              \
		assert(i <= slice.size && j <= slice.size && i <= j);  \
		return (t##_slice) {                                   \
			.size = j - i,                                 \
			.buf = slice.buf + i,                          \
	       	};                                                     \
	}                                                              \
	                                                               \
	static inline t##_slice                                        \
	t##_slice1(t##_slice slice, size_t i)                          \
	{                                                              \
		assert(i <= slice.size);                               \
		return (t##_slice) {                                   \
			.size = slice.size - i,                        \
			.buf = slice.buf + i,                          \
		};                                                     \
	}

#endif