shared_memory.h

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#ifndef CPPCOMMON_SYSTEM_SHARED_MEMORY_H
#define CPPCOMMON_SYSTEM_SHARED_MEMORY_H
 
#include "errors/exceptions.h"
 
#include <memory>
#include <string>
 
namespace CppCommon {
 
 
class SharedMemory
{
public:
 
    explicit SharedMemory(const std::string& name, size_t size);
    SharedMemory(const SharedMemory&) = delete;
    SharedMemory(SharedMemory&& shmem) = delete;
    ~SharedMemory();
 
    SharedMemory& operator=(const SharedMemory&) = delete;
    SharedMemory& operator=(SharedMemory&& shmem) = delete;
 
    explicit operator bool() const { return (ptr() != nullptr); }
 
    const std::string& name() const noexcept { return _name; }
    size_t size() const noexcept { return _size; }
 
    void* ptr();
    const void* ptr() const;
 
    bool owner() const;
 
private:
    class Impl;
 
    Impl& impl() noexcept { return reinterpret_cast<Impl&>(_storage); }
    const Impl& impl() const noexcept { return reinterpret_cast<Impl const&>(_storage); }
 
    static const size_t StorageSize = 64;
    static const size_t StorageAlign = 8;
    alignas(StorageAlign) std::byte _storage[StorageSize];
 
    std::string _name;
    size_t _size;
};
 
} // namespace CppCommon
 
#endif // CPPCOMMON_SYSTEM_SHARED_MEMORY_H