Function fields [src]

Prototype

 pub fn fields(comptime T: type) switch (@typeInfo(T)) { .@"struct" => []const Type.StructField, .@"union" => []const Type.UnionField, .@"enum" => []const Type.EnumField, .error_set => []const Type.Error, else => @compileError("Expected struct, union, error set or enum type, found '" ++ @typeName(T) ++ "'"), }

Parameters

T: type

Example

 test fields {
    const E1 = enum {
        A,
    };
    const E2 = error{A};
    const S1 = struct {
        a: u8,
    };
    const U1 = union {
        a: u8,
    };

    const e1f = comptime fields(E1);
    const e2f = comptime fields(E2);
    const sf = comptime fields(S1);
    const uf = comptime fields(U1);

    try testing.expect(e1f.len == 1);
    try testing.expect(e2f.len == 1);
    try testing.expect(sf.len == 1);
    try testing.expect(uf.len == 1);
    try testing.expect(mem.eql(u8, e1f[0].name, "A"));
    try testing.expect(mem.eql(u8, e2f[0].name, "A"));
    try testing.expect(mem.eql(u8, sf[0].name, "a"));
    try testing.expect(mem.eql(u8, uf[0].name, "a"));
    try testing.expect(comptime sf[0].type == u8);
    try testing.expect(comptime uf[0].type == u8);
}

Source

  pub fn fields(comptime T: type) switch (@typeInfo(T)) {
    .@"struct" => []const Type.StructField,
    .@"union" => []const Type.UnionField,
    .@"enum" => []const Type.EnumField,
    .error_set => []const Type.Error,
    else => @compileError("Expected struct, union, error set or enum type, found '" ++ @typeName(T) ++ "'"),
} {
    return switch (@typeInfo(T)) {
        .@"struct" => |info| info.fields,
        .@"union" => |info| info.fields,
        .@"enum" => |info| info.fields,
        .error_set => |errors| errors.?, // must be non global error set
        else => @compileError("Expected struct, union, error set or enum type, found '" ++ @typeName(T) ++ "'"),
    };
}  