Type Function Elem [src]

Given a "memory span" type (array, slice, vector, or pointer to such), returns the "element type".

Prototype

pub fn Elem(comptime T: type) type

Parameters

T: type

Example

 test Elem {
    try testing.expect(Elem([1]u8) == u8);
    try testing.expect(Elem([*]u8) == u8);
    try testing.expect(Elem([]u8) == u8);
    try testing.expect(Elem(*[10]u8) == u8);
    try testing.expect(Elem(@Vector(2, u8)) == u8);
    try testing.expect(Elem(*@Vector(2, u8)) == u8);
    try testing.expect(Elem(?[*]u8) == u8);
}

Source

  pub fn Elem(comptime T: type) type {
    switch (@typeInfo(T)) {
        .array => |info| return info.child,
        .vector => |info| return info.child,
        .pointer => |info| switch (info.size) {
            .one => switch (@typeInfo(info.child)) {
                .array => |array_info| return array_info.child,
                .vector => |vector_info| return vector_info.child,
                else => {},
            },
            .many, .c, .slice => return info.child,
        },
        .optional => |info| return Elem(info.child),
        else => {},
    }
    @compileError("Expected pointer, slice, array or vector type, found '" ++ @typeName(T) ++ "'");
}  