World's fastest integer to ASCII conversion, C++14 template meta-programming implementation, any size integer 8,16,32,64-bit, signed or unsigned, forward (left-justified) or reverse (right justified). If you know of a faster implementation, let me know.
Compile and link itoa.cpp with your application.
itoa.h - programming interface
itoa_impl.h - implementation
itoa.cpp - definition of digits lookup table
Two function templates are provided to print the integer (without a NUL terminator)
- left-justified, going forward at the given buffer - returns pointer to the past-the-end character of the string
- right-justified, given a pointer to the end store in reverse - returns pointer to beginning of string
// print forward, return pointer to past-the-endtemplate<typename I> char* itoa_fwd (I i,char *buffer);
// print reverse, return pointer to first charactertemplate<typename I> char* itoa_rev (I i,char *buffer);