ziglings

1
//     const a: [4:0]u32       =  [4:0]u32{1, 2, 3, 4};
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是 .array, 额外存储 0 和长度
3
//     const b: [:0]const u32  = &[4:0]u32{1, 2, 3, 4};
4
是 .slice，必须指向 0 结尾的 array
5
//     const c: [*:0]const u32 = &[4:0]u32{1, 2, 3, 4};
6
是 .pointer，末端必须 0

1
(my_seq: anytype)
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const my_typeinfo = @typeInfo(@TypeOf(my_seq));
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    switch (my_typeinfo) {
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        .array => {
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            ...
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        },
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        .pointer => {
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            ...
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        },
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        else => unreachable,

1
fn printTuple(tuple: anytype) void {
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    const fields = @typeInfo(@TypeOf(tuple)).@"struct".fields;
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    inline for (fields) |field| {
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        print("\"{s}\"({any}):{any} ", .{
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            field.name,
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            field.type,
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            @field(tuple, field.name)
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        });
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    }

1
var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
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defer arena.deinit();
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const allocator = arena.allocator();
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// 直接用切片引用这块儿分配
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const avg: []f64 = try allocator.alloc(f64, 5);
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// 然后当普通切片使用，例如:
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avg[2] = ...