43 lines
1.8 KiB
Markdown
43 lines
1.8 KiB
Markdown
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# intc
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A MIT licensed C/C++ uint128/256 type library, originally adapted from [calccrypto's uint128/256 library](https://github.com/calccrypto/uint256_t) turned into a primarily C first library and opt out C++ features when compiling in C++ mode.
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The overarching motivation of the library can be summed up as follows
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- Single header, drop in - no build configuration required.
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- Minimal dependencies (only depends on stdbool.h when compiling in C).
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- Zero allocations (in other libs typically when converting to strings).
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- Ability to rename the API via the pre-processor for tighter integration into C code bases
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- C++ features are optional and can be opt out via the pre-processor, i.e. operator overloading and constructors.
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## Usage
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Include `intc.h` and defined `INTC_IMPLEMENTATION` in one and only one file to enable the implementation in that translation unit.
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```cpp
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#define INTC_IMPLEMENTATION
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#include "intc.h"
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#include <stdio.h>
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int main(int, char**)
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{
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#if defined(__cplusplus)
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intc_u256 value = 32;
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value += 32;
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if (value == 64)
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value *= 1'000'000'000'000;
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intc_u256_string string = intc_u256_readable_int_str(value);
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printf("%.*s\n", string.size, string.str); // 64,000,000,000,000
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#else
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intc_u256 value = INTC_U64_TO_U256(32);
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value = intc_u256_add_u64(value, 32);
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if (intc_u256_eq_u64(value, 64))
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value = intc_u256_mul(value, INTC_U64_TO_U256(1'000'000'000'000));
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intc_u256_string string = intc_u256_readable_int_str(value);
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printf("%.*s\n", string.size, string.str); // 64,000,000,000,000
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#endif
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return 0;
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}
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```
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## Tests
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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.
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