Function fieldInfo [src]

Prototype

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

Parameters

T: typefield: FieldEnum(T)

Example

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

    const e1f = fieldInfo(E1, .A);
    const e2f = fieldInfo(E2, .A);
    const sf = fieldInfo(S1, .a);
    const uf = fieldInfo(U1, .a);

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

Source

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