Methods
format_to
int format_to(var self, int pos, const char* fmt, ...);
int format_to_va(var self, int pos, const char* fmt, va_list va);
Write a formatted string fmt to the object self at position pos.
format_from
int format_from(var self, int pos, const char* fmt, ...);
int format_from_va(var self, int pos, const char* fmt, va_list va);
Read a formatted string fmt from the object self at position pos.
Examples
Usage
/* printf("Hello my name is %s, I'm %i\n", "Dan", 23); */
format_to($(File, stdout), 0,
"Hello my name is %s, I'm %i\n", "Dan", 23);
Format
Read or Write with Format String
Format abstracts the class of operations such as scanf, sprintf and fprintf with matching semantics. It provides general printf and scanf functionality for several different types objects in a uniform way. This class is essentially an in-between class, used by the Show class to read and write output.
It is important to note that the semantics of these operations match printf and not the newly defined Show class. For example it is perfectly valid to pass a C int to these functions, while the println function from Show must be passed only var objects.
Definition
struct Format {
int (*format_to)(var,int,const char*,va_list);
int (*format_from)(var,int,const char*,va_list);
};