Move parent creation to the separate function

include/tmp/directory.hpp

@@ -62,10 +62,7 @@ class directory final : public path {
 private:
     /// Creates a unique temporary directory based on the given @p prefix
     static std::filesystem::path create(std::string_view prefix) {
-        const auto parent = std::filesystem::temp_directory_path() / prefix;
-        std::filesystem::create_directories(parent);
-
-        auto pattern = std::string(parent / "XXXXXX");
+        auto pattern = std::string(make_parent(prefix) / "XXXXXX");
         if (mkdtemp(pattern.data()) == nullptr) {
             auto ec = std::error_code(errno, std::system_category());
             throw error("Cannot create temporary directory", ec);

include/tmp/file.hpp

@@ -91,10 +91,7 @@ class file final : public path {
 
     /// Creates a unique temporary file based on the given @p prefix
     static std::filesystem::path create(std::string_view prefix) {
-        const auto parent = std::filesystem::temp_directory_path() / prefix;
-        std::filesystem::create_directories(parent);
-
-        auto pattern = std::string(parent / "XXXXXX");
+        auto pattern = std::string(make_parent(prefix) / "XXXXXX");
         if (mkstemp(pattern.data()) == -1) {
             auto ec = std::error_code(errno, std::system_category());
             throw error("Cannot create temporary file", ec);

include/tmp/path.hpp

@@ -52,7 +52,14 @@ class path {
     /// Creates a unique temporary path using the given constructor function.
     /// @param prefix the path between system temp
     /// @param creator wrapped mktemp-like function that returns resulting path
-    explicit path(std::filesystem::path path) : underlying(path){}
+    explicit path(std::filesystem::path path) : underlying(path) {}
+
+    static std::filesystem::path make_parent(std::string_view prefix) {
+        const auto parent = std::filesystem::temp_directory_path() / prefix;
+        std::filesystem::create_directories(parent);
+
+        return parent;
+    }
 
 private:
     /// Deletes this path recursively, ignoring any errors