Crunch::IntegrityPolicy Concept Reference

Concept defining the interface for message integrity policies. More...

#include <crunch_integrity.hpp>

Concept definition

template<typename Policy>
concept Crunch::IntegrityPolicy =  requires(std::span<const std::byte> data) {
    {
        std::bool_constant<(Policy::size(), true)>()
    } -> std::same_as<std::true_type>;
    { Policy::size() } -> std::same_as<std::size_t>;
    {
        std::bool_constant<(Policy::calculate(std::span<const std::byte>{}),
                            true)>()
    } -> std::same_as<std::true_type>;
 
    {
        Policy::calculate(data)
    } -> std::same_as<std::array<std::byte, Policy::size()>>;
}

Detailed Description

Concept defining the interface for message integrity policies.

An IntegrityPolicy calculates a checksum or digest appended to serialized messages. Implementations must provide:

• size(): Returns the checksum size in bytes. Must be constexpr.
• calculate(data): Computes the checksum for the given byte span. Must be constexpr.