复现已有算法

third_party/drogon_repo/lib/src/CacheFile.h

@@ -0,0 +1,53 @@
+/**
+ *
+ *  CacheFile.h
+ *  An Tao
+ *
+ *  Copyright 2018, An Tao.  All rights reserved.
+ *  https://github.com/an-tao/drogon
+ *  Use of this source code is governed by a MIT license
+ *  that can be found in the License file.
+ *
+ *  Drogon
+ *
+ */
+
+#pragma once
+
+#include <trantor/utils/NonCopyable.h>
+#include <string>
+#include <string_view>
+#include <stdio.h>
+
+namespace drogon
+{
+class CacheFile : public trantor::NonCopyable
+{
+  public:
+    explicit CacheFile(const std::string &path, bool autoDelete = true);
+    ~CacheFile();
+
+    void append(const std::string &data)
+    {
+        append(data.data(), data.length());
+    }
+
+    void append(const char *data, size_t length);
+
+    std::string_view getStringView()
+    {
+        if (data())
+            return std::string_view(data_, dataLength_);
+        return std::string_view();
+    }
+
+  private:
+    char *data();
+    size_t length();
+    FILE *file_{nullptr};
+    bool autoDelete_{true};
+    const std::string path_;
+    char *data_{nullptr};
+    size_t dataLength_{0};
+};
+}  // namespace drogon