Refactored #7 out into class files like I should have to begin with.

2022/7/Folder.cpp

@@ -0,0 +1,58 @@
+#include "Folder.h"
+
+#include <algorithm>
+#include <iostream>
+
+Folder::Folder(const std::string &filename)
+	: File(filename, 0)
+{
+}
+
+unsigned long Folder::Size() const
+{
+	unsigned long size = 0;
+	for(const auto *file : files)
+		size += file->Size();
+	return size;
+}
+
+void Folder::AddFile(const std::string &filename,
+                     unsigned long size)
+{
+	// make sure the file doesn't already exist:
+	if(std::find_if(files.begin(), files.end(),
+	                [&](const File *file) {
+		                return file->Filename() == filename;
+	                }) != files.end())
+	{
+		std::cerr << "Folder \"" << this->Filename() << "\" already contains "
+		          << "the file \"" << filename << "\"." << std::endl;
+		exit(-1);
+	}
+
+	// increment this folder's size total:
+	this->size += size;
+
+	// add the file:
+	files.push_back(new File(filename, size));
+}
+
+void Folder::AddFolder(const std::string &name)
+{
+	if(std::find_if(files.begin(), files.end(),
+	                [&](const File *file) {
+		                return file->Filename() == name;
+	                }) != files.end())
+	{
+		std::cout << "NOTE: Folder \"" << this->Filename() << "\" already contains "
+		          << "the subfolder \"" << name << "\"." << std::endl;
+		// exit(-1);
+	}
+
+	files.push_back(new Folder(name));
+}
+
+const std::vector<File*>& Folder::Files() const
+{
+	return files;
+}