A C++20 implementation of safe (wrap around) integers following MISRA C++ rules

Overview

PSsimplesafeint

A C++20 implementation of safe (wrap around) integers following MISRA C++ rules.

I might also work on a C++17 implementation, but this will look uglier due to SFINAE and DIY comparison.

It provides the following types in namspace psssint and corresponding UDL operators in namespace psssint::literals:

// unsigned
enum class ui8;   auto a = 1_ui8;
enum class ui16;  auto b = 2_ui16;
enum class ui32;  auto c = 3_ui32;
enum class ui64;  auto d = 4_ui64;
// signed
enum class si8;   auto e = 5_si8;
enum class si16;  auto f = 6_si16;
enum class si32;  auto g = 7_si32;
enum class si64;  auto h = 8_si64;

Some extra features:

  • an output operator is defined
  • The UDL operators check for range.
  • not recommended features:
    • to_int(val) promotes the safe integer val to built-in integer keeping its signedness
    • to_underlying(val) allows access to the underlying-type's value, use with care in operations.
    • from_int(val) converts allowed integer type's value to corresponding safe integer type.
    • from_int_to<safeinttype>(val) converts integer to safe integer type with range check (throws).

The following MISRA C++ recommendations for integer usage are implemented:

  • No mixing of signed and unsigned types or with any standard-defined arithmetic types
  • Integral promotion (only when mixing types in operations) will keep signedness
  • Operations using the same operand type result in said type (no implicit promotion)
  • Operations using mixed types of the same signedness promote to the bigger type first
  • All operations wrap safely (2's complement), even for signed operands
  • Bitwise operations are only defined for unsigned types
  • Negation is only defined for signed types
  • Comparison is only available through operands of the same type, using built-in <=>

What else do you want?

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Comments
  • Make division by zero well defined

    Make division by zero well defined

    As of https://link.springer.com/article/10.1007/s00224-007-9035-4 divison by zero should be 0 to have well-defined total operations.

    Currently the division operations have assert(divisor != 0); as a check.

    Alternatively, the zero check could be made customizable by a macro different from assert() or throw an exception (dependency on exception handling, not good).

    Will request feedback... (some are against it).

    opened by PeterSommerlad 2
Owner
Peter Sommerlad
Peter Sommerlad is a consultant and trainer for Safe & Modern C++ and Agile Software Engineering. Peter was professor and director of @IFS-HSR
Peter Sommerlad
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