From e82785d6b5da237931288255481143f7b1430e51 Mon Sep 17 00:00:00 2001
From: Maksim Denisov <denisov.maksim@huawei.com>
Date: Mon, 17 Feb 2025 14:30:30 +0100
Subject: TmpDir: Create temporary files

... and keep parent directories alive while nested directories exist.
---
 src/utils/cpp/tmp_dir.hpp | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

(limited to 'src/utils/cpp/tmp_dir.hpp')

diff --git a/src/utils/cpp/tmp_dir.hpp b/src/utils/cpp/tmp_dir.hpp
index 28805e3d..4312d97e 100644
--- a/src/utils/cpp/tmp_dir.hpp
+++ b/src/utils/cpp/tmp_dir.hpp
@@ -17,8 +17,11 @@
 
 #include <filesystem>
 #include <memory>
+#include <string>
 #include <utility>
 
+class TmpFile;
+
 class TmpDir final {
   public:
     using Ptr = std::shared_ptr<TmpDir const>;
@@ -43,6 +46,14 @@ class TmpDir final {
     [[nodiscard]] static auto CreateNestedDirectory(
         TmpDir::Ptr const& parent) noexcept -> Ptr;
 
+    /// \brief Create a new unique temporary file. To guarantee uniqueness,
+    /// every file gets created in a new temporary directory. This file remains
+    /// valid even if the parent directory goes out of scope.
+    [[nodiscard]] static auto CreateFile(
+        TmpDir::Ptr const& parent,
+        std::string const& file_name = "file") noexcept
+        -> std::shared_ptr<TmpFile const>;
+
   private:
     explicit TmpDir(TmpDir::Ptr parent, std::filesystem::path path) noexcept
         : parent_{std::move(parent)}, tmp_dir_{std::move(path)} {}
@@ -55,4 +66,30 @@ class TmpDir final {
     std::filesystem::path tmp_dir_;
 };
 
+class TmpFile final {
+    friend class TmpDir;
+
+  public:
+    using Ptr = std::shared_ptr<TmpFile const>;
+
+    TmpFile(TmpFile const&) = delete;
+    auto operator=(TmpFile const&) -> TmpFile& = delete;
+    TmpFile(TmpFile&& other) = delete;
+    auto operator=(TmpFile&&) -> TmpFile& = delete;
+    ~TmpFile() noexcept = default;
+
+    [[nodiscard]] auto GetPath() const& noexcept
+        -> std::filesystem::path const& {
+        return file_path_;
+    }
+
+  private:
+    explicit TmpFile(TmpDir::Ptr parent,
+                     std::filesystem::path file_path) noexcept
+        : parent_{std::move(parent)}, file_path_{std::move(file_path)} {}
+
+    TmpDir::Ptr parent_;
+    std::filesystem::path file_path_;
+};
+
 #endif  // INCLUDED_SRC_OTHER_TOOLS_TMP_DIR_HPP
-- 
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