dll.h

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#ifndef CPPCOMMON_SYSTEM_DLL_H
#define CPPCOMMON_SYSTEM_DLL_H
 
#include "filesystem/path.h"
#include "system/exceptions.h"
 
#include <memory>
 
 
#if defined(_WIN32) || defined(_WIN64)
  #ifdef EXPORTS
    #define EXPORT __declspec(dllexport)
  #else
    #define EXPORT __declspec(dllimport)
  #endif
#else
  #define EXPORT
#endif
 
 
#define API extern "C" EXPORT
 
namespace CppCommon {
 
 
class DLL
{
public:
    DLL();
 
    DLL(const Path& path, bool load = true);
    DLL(const DLL& dll);
    DLL(DLL&& dll) noexcept;
    ~DLL();
 
    DLL& operator=(const Path& path);
    DLL& operator=(const DLL& dll);
    DLL& operator=(DLL&& dll) noexcept;
 
    explicit operator bool() const { return IsLoaded(); }
 
    const Path path() const;
 
    bool IsLoaded() const;
 
    bool IsResolve(const std::string& name) const;
 
 
    bool Load();
 
    bool Load(const Path& path);
 
 
    void Unload();
 
 
    template <typename T>
    T* Resolve(const std::string& name) const;
 
 
    static std::string prefix();
 
    static std::string extension();
 
    void swap(DLL& dll) noexcept;
    friend void swap(DLL& dll1, DLL& dll2) noexcept;
 
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 = 48;
    static const size_t StorageAlign = 8;
    alignas(StorageAlign) std::byte _storage[StorageSize];
 
 
    void* ResolveAddress(const std::string& name) const;
};
 
} // namespace CppCommon
 
#include "dll.inl"
 
#endif // CPPCOMMON_SYSTEM_DLL_H