2.2.1 Readline Typedefs

For readabilty, we declare a number of new object types, all pointers to functions.

The reason for declaring these new types is to make it easier to write code describing pointers to C functions with appropriately prototyped arguments and return values.

For instance, say we want to declare a variable func as a pointer to a function which takes two int arguments and returns an int (this is the type of all of the Readline bindable functions). Instead of the classic C declaration

int (*func)();

or the ANSI-C style declaration

int (*func)(int, int);

we may write

rl_command_func_t *func;

The full list of function pointer types available is

typedef int rl_command_func_t (int, int);

typedef char *rl_compentry_func_t (const char *, int);

typedef char **rl_completion_func_t (const char *, int, int);

typedef char *rl_quote_func_t (char *, int, char *);

typedef char *rl_dequote_func_t (char *, int);

typedef int rl_compignore_func_t (char **);

typedef void rl_compdisp_func_t (char **, int, int);

typedef int rl_hook_func_t (void);

typedef int rl_getc_func_t (FILE *);

typedef int rl_linebuf_func_t (char *, int);

typedef int rl_intfunc_t (int);

#define rl_ivoidfunc_t rl_hook_func_t

typedef int rl_icpfunc_t (char *);

typedef int rl_icppfunc_t (char **);

typedef void rl_voidfunc_t (void);

typedef void rl_vintfunc_t (int);

typedef void rl_vcpfunc_t (char *);

typedef void rl_vcppfunc_t (char **);