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math: make cast return optional instead of an error

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This commit is contained in:
Ali Chraghi
2022-05-22 19:36:59 +04:30
committed by Andrew Kelley
parent ddd5b57045
commit 0e6285c8fc
37 changed files with 152 additions and 175 deletions
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6
lib/std/io/fixed_buffer_stream.zig
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@@ -76,20 +76,20 @@ pub fn FixedBufferStream(comptime Buffer: type) type {
}
pub fn seekTo(self: *Self, pos: u64) SeekError!void {
self.pos = if (std.math.cast(usize, pos)) |x| std.math.min(self.buffer.len, x) else |_| self.buffer.len;
self.pos = if (std.math.cast(usize, pos)) |x| std.math.min(self.buffer.len, x) else self.buffer.len;
}
pub fn seekBy(self: *Self, amt: i64) SeekError!void {
if (amt < 0) {
const abs_amt = std.math.absCast(amt);
const abs_amt_usize = std.math.cast(usize, abs_amt) catch std.math.maxInt(usize);
const abs_amt_usize = std.math.cast(usize, abs_amt) orelse std.math.maxInt(usize);
if (abs_amt_usize > self.pos) {
self.pos = 0;
} else {
self.pos -= abs_amt_usize;
}
} else {
const amt_usize = std.math.cast(usize, amt) catch std.math.maxInt(usize);
const amt_usize = std.math.cast(usize, amt) orelse std.math.maxInt(usize);
const new_pos = std.math.add(usize, self.pos, amt_usize) catch std.math.maxInt(usize);
self.pos = std.math.min(self.buffer.len, new_pos);
}