Merge pull request #6156 from lioncash/lock-discard

kernel: Mark lock helper classes as [[nodiscard]]

src/core/hle/kernel/k_scheduler.h

@@ -198,7 +198,7 @@ private:
     Common::SpinLock guard{};
 };
 
-class KScopedSchedulerLock : KScopedLock<GlobalSchedulerContext::LockType> {
+class [[nodiscard]] KScopedSchedulerLock : KScopedLock<GlobalSchedulerContext::LockType> {
 public:
     explicit KScopedSchedulerLock(KernelCore & kernel);
     ~KScopedSchedulerLock();

src/core/hle/kernel/k_scoped_lock.h

@@ -20,19 +20,22 @@ concept KLockable = !std::is_reference_v<T> && requires(T & t) {
 };
 
 template <typename T>
-requires KLockable<T> class KScopedLock {
+requires KLockable<T> class [[nodiscard]] KScopedLock {
 public:
     explicit KScopedLock(T * l) : lock_ptr(l) {
         this->lock_ptr->Lock();
     }
-    explicit KScopedLock(T& l) : KScopedLock(std::addressof(l)) { /* ... */
+    explicit KScopedLock(T & l) : KScopedLock(std::addressof(l)) {}
-    }
+
     ~KScopedLock() {
         this->lock_ptr->Unlock();
     }
 
     KScopedLock(const KScopedLock&) = delete;
+    KScopedLock& operator=(const KScopedLock&) = delete;
+
     KScopedLock(KScopedLock &&) = delete;
+    KScopedLock& operator=(KScopedLock&&) = delete;
 
 private:
     T* lock_ptr;

src/core/hle/kernel/k_scoped_scheduler_lock_and_sleep.h

@@ -15,7 +15,7 @@
 
 namespace Kernel {
 
-class KScopedSchedulerLockAndSleep {
+class [[nodiscard]] KScopedSchedulerLockAndSleep {
 public:
     explicit KScopedSchedulerLockAndSleep(KernelCore & kernel, KThread * t, s64 timeout)
         : kernel(kernel), thread(t), timeout_tick(timeout) {