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

EscapeTheBackroomsGUiTest/vcpkg_Out/include/cpr/async.h

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+#ifndef CPR_ASYNC_H
+#define CPR_ASYNC_H
+
+#include "singleton.h"
+#include "threadpool.h"
+
+namespace cpr {
+
+class GlobalThreadPool : public ThreadPool {
+    CPR_SINGLETON_DECL(GlobalThreadPool)
+  protected:
+    GlobalThreadPool() = default;
+
+  public:
+    ~GlobalThreadPool() override = default;
+};
+
+/**
+ * Return a future, calling future.get() will wait task done and return RetType.
+ * async(fn, args...)
+ * async(std::bind(&Class::mem_fn, &obj))
+ * async(std::mem_fn(&Class::mem_fn, &obj))
+ **/
+template <class Fn, class... Args>
+auto async(Fn&& fn, Args&&... args) -> std::future<decltype(fn(args...))> {
+    return GlobalThreadPool::GetInstance()->Submit(std::forward<Fn>(fn), std::forward<Args>(args)...);
+}
+
+class async {
+  public:
+    static void startup(size_t min_threads = CPR_DEFAULT_THREAD_POOL_MIN_THREAD_NUM, size_t max_threads = CPR_DEFAULT_THREAD_POOL_MAX_THREAD_NUM, std::chrono::milliseconds max_idle_ms = CPR_DEFAULT_THREAD_POOL_MAX_IDLE_TIME) {
+        GlobalThreadPool* gtp = GlobalThreadPool::GetInstance();
+        if (gtp->IsStarted()) {
+            return;
+        }
+        gtp->SetMinThreadNum(min_threads);
+        gtp->SetMaxThreadNum(max_threads);
+        gtp->SetMaxIdleTime(max_idle_ms);
+        gtp->Start();
+    }
+
+    static void cleanup() {
+        GlobalThreadPool::ExitInstance();
+    }
+};
+
+} // namespace cpr
+
+#endif