C/C++ - MIT licensed - uint128/256 - single file header - minimal dependencies
.gitignore | ||
build_tests.bat | ||
intc_tests.h | ||
intc.h | ||
README.md |
intc
A MIT licensed C/C++ uint128/256 type library, originally adapted from calccrypto's uint128/256 library turned into a primarily C first library and opt out C++ features when compiling in C++ mode.
The overarching motivation of the library can be summed up as follows
- Single header, drop in - no build configuration required.
- Minimal dependencies (only depends on stdbool.h when compiling in C).
- Zero allocations (in other libs typically when converting to strings).
- Ability to rename the API via the pre-processor for tighter integration into C code bases
- C++ features are optional and can be opt out via the pre-processor, i.e. operator overloading and constructors.
Usage
Include intc.h
and defined INTC_IMPLEMENTATION
in one and only one file to enable the implementation in that translation unit.
#define INTC_IMPLEMENTATION
#include "intc.h"
#include <stdio.h>
int main(int, char**)
{
#if defined(__cplusplus)
intc_u256 value = 32;
value += 32;
if (value == 64)
value *= 1'000'000'000'000;
intc_u256_string string = intc_u256_readable_int_str(value);
printf("%.*s\n", string.size, string.str); // 64,000,000,000,000
#else
intc_u256 value = INTC_U64_TO_U256(32);
value = intc_u256_add_u64(value, 32);
if (intc_u256_eq_u64(value, 64))
value = intc_u256_mul(value, INTC_U64_TO_U256(1'000'000'000'000));
intc_u256_string string = intc_u256_readable_int_str(value);
printf("%.*s\n", string.size, string.str); // 64,000,000,000,000
#endif
return 0;
}
Tests
Tests are adapted from calccrypto's test suite and can be built by running build_tests.bat
for Windows and build_tests.sh
for Unix. For Windows MSVC's cl compiler must be available on the path and GCC must be available on Unix.