Made Project Buildable. Just realized Project cant be Build for Others

EscapeTheBackroomsGUiTest/vcpkg_Out/include/cpr/singleton.h

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+#ifndef CPR_SINGLETON_H
+#define CPR_SINGLETON_H
+
+#include <mutex>
+
+#ifndef CPR_DISABLE_COPY
+#define CPR_DISABLE_COPY(Class) \
+    Class(const Class&) = delete; \
+    Class& operator=(const Class&) = delete;
+#endif
+
+#ifndef CPR_SINGLETON_DECL
+#define CPR_SINGLETON_DECL(Class) \
+    public: \
+        static Class* GetInstance(); \
+        static void ExitInstance(); \
+    private: \
+        CPR_DISABLE_COPY(Class) \
+        static Class* s_pInstance; \
+        static std::mutex s_mutex;
+#endif
+
+#ifndef CPR_SINGLETON_IMPL
+#define CPR_SINGLETON_IMPL(Class) \
+    Class* Class::s_pInstance = nullptr; \
+    std::mutex Class::s_mutex; \
+    Class* Class::GetInstance() { \
+        if (s_pInstance == nullptr) { \
+            s_mutex.lock(); \
+            if (s_pInstance == nullptr) { \
+                s_pInstance = new Class; \
+            } \
+            s_mutex.unlock(); \
+        } \
+        return s_pInstance; \
+    } \
+    void Class::ExitInstance() { \
+        s_mutex.lock(); \
+        if (s_pInstance) {  \
+            delete s_pInstance; \
+            s_pInstance = nullptr; \
+        }   \
+        s_mutex.unlock(); \
+    }
+#endif
+
+#endif