Datasheet

The C and C++ Libraries

Note

Because the compiler optimizes the data segment, it reorders and removes parts of

locale definitions, and breaks the data structures. The code examples provided are for

informational purposes only. In practice, the definitions require additional pragmas to

disable optimizations.

4.6.14 __LC_COLLATE_DEF

This macro is used to create collate blocks used when sorting ASCII characters. The

definition from

rt_locale.h

, the definition of a macro for creating an empty table, and

sample code are shown in Example 4-10 and Example 4-11.

For all the macros, the first two arguments are a symbol prefix and a locale name. The

resulting locale block is addressed by the expression

&symprefix_start

, and the index

entry by the expression

&symprefix_index

Example 4-10 Macro for use with array

#define __LC_COLLATE_DEF(sym,ln) \

static const int sym##_index = ~3&(3+(268+(~3&(3+sizeof(ln))))); \

static const char sym##_lname[~3 & (3 + sizeof(ln))] = ln; \

static const int sym##_pname = -4-(~3 & (3 + sizeof(ln))); \

static const int sym##_start = 4; \

static const char sym##_table[] =

Example 4-11 Macro that generates default table

#define __LC_COLLATE_TRIVIAL_DEF(sym,ln) \

static const int sym##_index = ~3&(3+(12+(~3&(3+sizeof(ln))))); \

static const char sym##_lname[~3 & (3 + sizeof(ln))] = ln; \

static const int sym##_pname = -4-(~3 & (3 + sizeof(ln))); \

static const int sym##_start = 0;

Usage

See _get_lc_collate() on page 4-32. See also __LC_CTYPE_DEF on page 4-42 for

details of the side-effects of compiler optimizations.