diff options
| -rw-r--r-- | include/ruby/memory_view.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/include/ruby/memory_view.h b/include/ruby/memory_view.h index dc6c971593..5d48c359c1 100644 --- a/include/ruby/memory_view.h +++ b/include/ruby/memory_view.h @@ -54,8 +54,8 @@ typedef struct { /* A string to describe the format of an element, or NULL for unsigned byte. * The format string is a sequence the following pack-template specifiers: * - * c, C, s, s!, S, S!, n, v, i, i!, I, I!, l, l!, - * L, L!, N, V, f, e, g, d, E, G, j, J, x + * c, C, s, s!, S, S!, n, v, i, i!, I, I!, l, l!, L, L!, + * N, V, f, e, g, q, q!, Q, Q!, d, E, G, j, J, x * * For example, "dd" for an element that consists of two double values, * and "CCC" for an element that consists of three bytes, such as @@ -63,6 +63,11 @@ typedef struct { * * Also, the value endianness can be explicitly specified by '<' or '>' * following a value type specifier. + * + * The items are packed contiguously. When you emulate the alignment of + * structure members, put '|' at the beginning of the format string, + * like "|iqc". On x86_64 Linux ABI, the size of the item by this format + * is 24 bytes instead of 13 bytes. */ const char *format; |