Cothread.h

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#ifndef LIBCOMMUNISM_COTHREAD_H
#define LIBCOMMUNISM_COTHREAD_H
 
#include <array>
#include <cstddef>
#include <cstdint>
#include <functional>
#include <span>
#include <string>
 
namespace libcommunism {
struct CothreadImpl;
 
class Cothread {
    public:
        using Entry = std::function<void()>;
 
        [[nodiscard]] static Cothread *Current();
 
        static void SetReturnHandler(const std::function<void(Cothread *)> &handler);
 
        static void ResetReturnHandler();
 
        Cothread(const Entry &entry, const size_t stackSize = 0);
 
        Cothread(const Entry &entry, std::span<uintptr_t> stack);
 
        ~Cothread();
 
        void switchTo();
 
        constexpr auto &getLabel() const {
            return this->label;
        }
 
        void setLabel(const std::string &newLabel) {
            this->label = newLabel;
        }
 
        size_t getStackSize() const;
 
        void *getStack() const;
 
    private:
        Cothread(CothreadImpl *impl) : impl(impl) {}
 
    private:
        std::string label{""};
 
    private:
        CothreadImpl *impl{nullptr};
 
        static thread_local Cothread *gCurrent;
 
        std::array<uintptr_t, 32> implBuffer;
        bool implBufferUsed{false};
};
}
 
#endif