f2077f57ae
Also, rework this logic a little to make it simpler. The length of the result slice is now computed in one place.
58 lines
1.7 KiB
Zig
58 lines
1.7 KiB
Zig
comptime {
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const in: []const comptime_int = &.{0};
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const out: []const type = @ptrCast(in);
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_ = out;
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}
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const One = u8;
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const Two = [2]u8;
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const Three = [3]u8;
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const Four = [4]u8;
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const Five = [5]u8;
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// []One -> []Two (small to big, divides neatly)
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comptime {
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const in: []const One = &.{ 1, 0, 0 };
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const out: []const Two = @ptrCast(in);
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_ = out;
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}
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comptime {
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const in: *const [3]One = &.{ 1, 0, 0 };
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const out: []const Two = @ptrCast(in);
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_ = out;
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}
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// []Four -> []Five (small to big, does not divide)
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comptime {
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const in: []const Four = &.{.{ 0, 0, 0, 0 }};
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const out: []const Five = @ptrCast(in);
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_ = out;
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}
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comptime {
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const in: *const [1]Four = &.{.{ 0, 0, 0, 0 }};
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const out: []const Five = @ptrCast(in);
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_ = out;
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}
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// []Three -> []Two (big to small, does not divide)
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comptime {
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const in: []const Three = &.{.{ 0, 0, 0 }};
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const out: []const Two = @ptrCast(in);
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_ = out;
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}
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comptime {
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const in: *const [1]Three = &.{.{ 0, 0, 0 }};
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const out: []const Two = @ptrCast(in);
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_ = out;
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}
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// error
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//
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// :3:31: error: cannot infer length of comptime-only '[]const type' from incompatible '[]const comptime_int'
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// :16:30: error: slice length '3' does not divide exactly into destination elements
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// :21:30: error: type '[3]u8' does not divide exactly into destination elements
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// :28:31: error: slice length '1' does not divide exactly into destination elements
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// :33:31: error: type '[1][4]u8' does not divide exactly into destination elements
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// :40:30: error: slice length '1' does not divide exactly into destination elements
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// :45:30: error: type '[1][3]u8' does not divide exactly into destination elements
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