state.h

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#pragma once
 
#include <cstdint>
#include <string_view>
 
namespace contur {

    enum class ProcessState : std::uint8_t
    {
        New,        
        Ready,      
        Running,    
        Blocked,    
        Suspended,  
        Terminated, 
    };

    [[nodiscard]] constexpr bool isValidTransition(ProcessState from, ProcessState to) noexcept
    {
        switch (from)
        {
        case ProcessState::New:
            return to == ProcessState::Ready;
 
        case ProcessState::Ready:
            return to == ProcessState::Running || to == ProcessState::Suspended;
 
        case ProcessState::Running:
            return to == ProcessState::Ready || to == ProcessState::Blocked || to == ProcessState::Terminated;
 
        case ProcessState::Blocked:
            return to == ProcessState::Ready || to == ProcessState::Suspended;
 
        case ProcessState::Suspended:
            return to == ProcessState::Ready;
 
        case ProcessState::Terminated:
            return false; // Terminal state — no outgoing transitions.
        }
        return false;
    }

    [[nodiscard]] constexpr std::string_view processStateName(ProcessState state) noexcept
    {
        switch (state)
        {
        case ProcessState::New:
            return "New";
        case ProcessState::Ready:
            return "Ready";
        case ProcessState::Running:
            return "Running";
        case ProcessState::Blocked:
            return "Blocked";
        case ProcessState::Suspended:
            return "Suspended";
        case ProcessState::Terminated:
            return "Terminated";
        }
        return "Unknown";
    }
 
} // namespace contur