Added SharedLibrary wrapper for library handles.

source/mijin/util/os.hpp

@@ -7,6 +7,7 @@
 #include <csignal>
 #include <string>
 #include <string_view>
+#include <utility>
 #include "../detect.hpp"
 
 namespace mijin
@@ -41,6 +42,31 @@ struct LibraryHandle
     constexpr bool operator!() const noexcept { return data == nullptr; }
 };
 
+class SharedLibrary
+{
+private:
+    LibraryHandle mHandle;
+public:
+    SharedLibrary() noexcept = default;
+    SharedLibrary(const SharedLibrary&) = delete;
+    SharedLibrary(SharedLibrary&& other) noexcept : mHandle(std::exchange(other.mHandle, {})) {}
+    inline ~SharedLibrary() noexcept;
+
+    SharedLibrary& operator=(const SharedLibrary&) = delete;
+    SharedLibrary& operator=(SharedLibrary&& other) noexcept
+    {
+        mHandle = std::exchange(other.mHandle, {});
+        return *this;
+    }
+
+    constexpr operator bool() const noexcept { return static_cast<bool>(mHandle); }
+    constexpr bool operator!() const noexcept { return !mHandle; }
+
+    [[nodiscard]] inline bool open(std::string_view libraryFile) noexcept;
+    inline bool close() noexcept;
+    [[nodiscard]] inline void* loadSymbol(const char* symbolName) noexcept;
+};
+
 //
 // public functions
 //
@@ -52,6 +78,31 @@ void setCurrentThreadName(const char* threadName) noexcept;
 
 [[nodiscard]] std::string makeLibraryFilename(std::string_view libraryName) noexcept;
 
+SharedLibrary::~SharedLibrary() noexcept
+{
+    close();
+}
+
+bool SharedLibrary::open(std::string_view libraryFile) noexcept
+{
+    close();
+    mHandle = openSharedLibrary(libraryFile);
+    return static_cast<bool>(mHandle);
+}
+
+bool SharedLibrary::close() noexcept
+{
+    if (mHandle)
+    {
+        return closeSharedLibrary(std::exchange(mHandle, {}));
+    }
+    return false;
+}
+
+void* SharedLibrary::loadSymbol(const char* symbolName) noexcept
+{
+    return loadSymbolFromLibrary(mHandle, symbolName);
+}
 } // namespace mijin
 
 #endif // !defined(MIJIN_UTIL_OS_HPP_INCLUDED)