| ... | @@ -1947,8 +1947,24 @@ const Foo = extern enum { A, B, C }; | ... | @@ -1947,8 +1947,24 @@ const Foo = extern enum { A, B, C }; |
| 1947 | export fn entry(foo: Foo) void { } | 1947 | export fn entry(foo: Foo) void { } |
| 1948 | {#code_end#} | 1948 | {#code_end#} |
| 1949 | {#header_close#} | 1949 | {#header_close#} |
| 1950 | <p>TODO packed enum</p> | 1950 | {#header_open|packed enum#} |
| 1951 | {#see_also|@memberName|@memberCount|@tagName#} | 1951 | <p>By default, the size of enums is not guaranteed.</p> |
| | 1952 | <p><code>packed enum</code> causes the size of the enum to be the same as the size of the integer tag type |
| | 1953 | of the enum:</p> |
| | 1954 | {#code_begin|test#} |
| | 1955 | const std = @import("std"); |
| | 1956 | |
| | 1957 | test "packed enum" { |
| | 1958 | const Number = packed enum(u8) { |
| | 1959 | One, |
| | 1960 | Two, |
| | 1961 | Three, |
| | 1962 | }; |
| | 1963 | std.debug.assert(@sizeOf(Number) == @sizeOf(u8)); |
| | 1964 | } |
| | 1965 | {#code_end#} |
| | 1966 | {#header_close#} |
| | 1967 | {#see_also|@memberName|@memberCount|@tagName|@sizeOf#} |
| 1952 | {#header_close#} | 1968 | {#header_close#} |
| 1953 | {#header_open|union#} | 1969 | {#header_open|union#} |
| 1954 | {#code_begin|test|union#} | 1970 | {#code_begin|test|union#} |
Andrew Kelley <andrew@ziglang.org> 2018-04-06 19:14:49-04:00