df72480395
Now that clang-format makes [[nodiscard]] attributes format sensibly, we can apply them to several functions within the common library to allow the compiler to complain about any misuses of the functions.
76 lines
2.8 KiB
C++
76 lines
2.8 KiB
C++
// Copyright 2019 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#pragma once
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#include <string>
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namespace Common {
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/**
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* Provides a platform-independent interface for loading a dynamic library and retrieving symbols.
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* The interface maintains an internal reference count to allow one handle to be shared between
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* multiple users.
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*/
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class DynamicLibrary final {
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public:
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/// Default constructor, does not load a library.
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explicit DynamicLibrary();
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/// Automatically loads the specified library. Call IsOpen() to check validity before use.
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explicit DynamicLibrary(const char* filename);
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/// Moves the library.
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DynamicLibrary(DynamicLibrary&&) noexcept;
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DynamicLibrary& operator=(DynamicLibrary&&) noexcept;
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/// Delete copies, we can't copy a dynamic library.
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DynamicLibrary(const DynamicLibrary&) = delete;
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DynamicLibrary& operator=(const DynamicLibrary&) = delete;
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/// Closes the library.
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~DynamicLibrary();
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/// Returns the specified library name with the platform-specific suffix added.
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[[nodiscard]] static std::string GetUnprefixedFilename(const char* filename);
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/// Returns the specified library name in platform-specific format.
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/// Major/minor versions will not be included if set to -1.
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/// If libname already contains the "lib" prefix, it will not be added again.
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/// Windows: LIBNAME-MAJOR-MINOR.dll
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/// Linux: libLIBNAME.so.MAJOR.MINOR
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/// Mac: libLIBNAME.MAJOR.MINOR.dylib
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[[nodiscard]] static std::string GetVersionedFilename(const char* libname, int major = -1,
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int minor = -1);
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/// Returns true if a module is loaded, otherwise false.
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[[nodiscard]] bool IsOpen() const {
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return handle != nullptr;
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}
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/// Loads (or replaces) the handle with the specified library file name.
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/// Returns true if the library was loaded and can be used.
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[[nodiscard]] bool Open(const char* filename);
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/// Unloads the library, any function pointers from this library are no longer valid.
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void Close();
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/// Returns the address of the specified symbol (function or variable) as an untyped pointer.
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/// If the specified symbol does not exist in this library, nullptr is returned.
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[[nodiscard]] void* GetSymbolAddress(const char* name) const;
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/// Obtains the address of the specified symbol, automatically casting to the correct type.
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/// Returns true if the symbol was found and assigned, otherwise false.
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template <typename T>
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[[nodiscard]] bool GetSymbol(const char* name, T* ptr) const {
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*ptr = reinterpret_cast<T>(GetSymbolAddress(name));
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return *ptr != nullptr;
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}
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private:
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/// Platform-dependent data type representing a dynamic library handle.
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void* handle = nullptr;
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};
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} // namespace Common
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