From 4710715102df3806479985679bd8048631ccaab5 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Tue, 18 Sep 2018 01:38:02 +0800
Subject: I think I can't sleep well after this commit.

Still a lot of bugs!!!
---
 CruUI/builder.h | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 CruUI/builder.h

(limited to 'CruUI/builder.h')

diff --git a/CruUI/builder.h b/CruUI/builder.h
new file mode 100644
index 00000000..3ae8724e
--- /dev/null
+++ b/CruUI/builder.h
@@ -0,0 +1,42 @@
+#pragma once
+
+#include "base.h"
+
+namespace cru
+{
+    template<typename T>
+    class OneTimeBuilder : public Object
+    {
+    protected:
+        OneTimeBuilder() = default;
+
+    public:
+        OneTimeBuilder(const OneTimeBuilder& other) = delete;
+        OneTimeBuilder(OneTimeBuilder&& other) = delete;
+        OneTimeBuilder& operator=(const OneTimeBuilder& other) = delete;
+        OneTimeBuilder& operator=(OneTimeBuilder&& other) = delete;
+        virtual ~OneTimeBuilder() = default;
+
+        T* Create()
+        {
+            if (is_valid_)
+            {
+                is_valid_ = false;
+                return OnCreate();
+            }
+            else
+                throw std::runtime_error("OneTimeBuilder is invalid.");
+        }
+
+        bool IsValid() const
+        {
+            return is_valid_;
+        }
+
+    protected:
+        virtual T* OnCreate() = 0;
+
+    private:
+        bool is_valid_ = true;
+    };
+}
-- 
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