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6b41beb370
These conversion routines accept a `round` argument to control how the result is rounded and return whether the result is exact. Most callers wanted this functionality and had hacks around it being missing. Also delete `std.math.big.rational` because it was only being used for float conversion, and using rationals for that is a lot more complex than necessary. It also required an allocator, whereas the new integer routines only need to be passed enough memory to store the result.
25 lines
746 B
Zig
25 lines
746 B
Zig
const std = @import("../std.zig");
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const assert = std.debug.assert;
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pub const int = @import("big/int.zig");
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pub const Limb = usize;
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const limb_info = @typeInfo(Limb).int;
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pub const SignedLimb = std.meta.Int(.signed, limb_info.bits);
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pub const DoubleLimb = std.meta.Int(.unsigned, 2 * limb_info.bits);
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pub const HalfLimb = std.meta.Int(.unsigned, limb_info.bits / 2);
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pub const SignedDoubleLimb = std.meta.Int(.signed, 2 * limb_info.bits);
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pub const Log2Limb = std.math.Log2Int(Limb);
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comptime {
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assert(std.math.floorPowerOfTwo(usize, limb_info.bits) == limb_info.bits);
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assert(limb_info.signedness == .unsigned);
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}
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test {
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_ = int;
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_ = Limb;
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_ = SignedLimb;
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_ = DoubleLimb;
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_ = SignedDoubleLimb;
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_ = Log2Limb;
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}
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