package math_big

/*
	Copyright 2021 Jeroen van Rijn <nom@duclavier.com>.
	Made available under Odin's BSD-2 license.

	An arbitrary precision mathematics implementation in Odin.
	For the theoretical underpinnings, see Knuth's The Art of Computer Programming, Volume 2, section 4.3.
	The code started out as an idiomatic source port of libTomMath, which is in the public domain, with thanks.

	This file collects public proc maps and their aliases.

	=== === === === === === === === === === === === === === === === === === === === === === === ===
	                                    Basic arithmetic.
	                                    See `public.odin`.
	=== === === === === === === === === === === === === === === === === === === === === === === ===
*/

/*
	High-level addition. Handles sign.
*/
add :: proc {
	/*
		int_add :: proc(dest, a, b: ^Int, allocator := context.allocator) -> (err: Error)
	*/
	int_add,
	/*
		Adds the unsigned `DIGIT` immediate to an `Int`, such that the
		`DIGIT` doesn't have to be turned into an `Int` first.

		int_add_digit :: proc(dest, a: ^Int, digit: DIGIT, allocator := context.allocator) -> (err: Error)
	*/
	int_add_digit,
};

/*
	err = sub(dest, a, b);
*/
sub :: proc {
	/*
		int_sub :: proc(dest, a, b: ^Int) -> (err: Error)
	*/
	int_sub,
	/*
		int_sub_digit :: proc(dest, a: ^Int, digit: DIGIT) -> (err: Error)
	*/
	int_sub_digit,
};

/*
	=== === === === === === === === === === === === === === === === === === === === === === === ===
	                                        Comparisons.
	                                    See `compare.odin`.
	=== === === === === === === === === === === === === === === === === === === === === === === ===
*/

is_initialized :: proc {
	/*
		int_is_initialized :: proc(a: ^Int) -> bool
	*/
	int_is_initialized,
};

is_zero :: proc {
	/*
		int_is_zero :: proc(a: ^Int) -> bool
	*/
	int_is_zero,
};

is_positive :: proc {
	/*
		int_is_positive :: proc(a: ^Int) -> bool
	*/
	int_is_positive,
};
is_pos :: is_positive;

is_negative :: proc {
	/*
		int_is_negative :: proc(a: ^Int) -> bool
	*/
	int_is_negative,
};
is_neg :: is_negative;

is_even :: proc {
	/*
		int_is_even :: proc(a: ^Int) -> bool
	*/
	int_is_even,
};

is_odd :: proc {
	/*
		int_is_odd :: proc(a: ^Int) -> bool
	*/
	int_is_odd,
};

is_power_of_two :: proc {
	/*
		platform_int_is_power_of_two :: proc(a: int) -> bool
	*/
	platform_int_is_power_of_two,
	/*
		int_is_power_of_two :: proc(a: ^Int) -> (res: bool)
	*/
	int_is_power_of_two,
};

compare :: proc {
	/*
		Compare two `Int`s, signed.

		int_compare :: proc(a, b: ^Int) -> Comparison_Flag
	*/
	int_compare,
	/*
		Compare an `Int` to an unsigned number upto the size of the backing type.

		int_compare_digit :: proc(a: ^Int, u: DIGIT) -> Comparison_Flag
	*/
	int_compare_digit,
};
cmp :: compare;

compare_magnitude :: proc {
	/*
		Compare the magnitude of two `Int`s, unsigned.
	*/
	int_compare_magnitude,
};
cmp_mag :: compare_magnitude;

/*
	=== === === === === === === === === === === === === === === === === === === === === === === ===
	                              Initialization and other helpers.
	                                    See `helpers.odin`.
	=== === === === === === === === === === === === === === === === === === === === === === === ===
*/

destroy :: proc {
	/*
		Clears one or more `Int`s and dellocates their backing memory.

		int_destroy :: proc(integers: ..^Int)
	*/
	int_destroy,
};