Add tmp::file::write and tmp::file::append

include/tmp/file.hpp

@@ -19,8 +19,8 @@ namespace tmp {
 /// <system's default location for temporary files>/prefix/. The prefix can be
 /// a path consisting of multiple segments.
 ///
-/// The tmp::file class also provides an additional operator<< which allows
-/// writing data to the temporary file using the same syntax as std::cout.
+/// The tmp::file class also provides an additional write and append methods
+/// which allow writing data to the temporary file.
 ///
 /// When the object is destroyed, it deletes the temporary file.
 ///
@@ -94,6 +94,16 @@ class file {
         return std::addressof(this->p);
     }
 
+    /// Writes the given @p content to this file discarding any previous content
+    void write(std::string_view content, std::ios_base::openmode mode = 0) {
+        std::ofstream { this->path(), std::ios_base::trunc | mode } << content;
+    }
+
+    /// Appends the given @p content to the end of this file
+    void append(std::string_view content, std::ios_base::openmode mode = 0) {
+        std::ofstream { this->path(), std::ios_base::app | mode } << content;
+    }
+
     /// Deletes this file when the enclosing scope is exited
     ~file() noexcept { this->remove(); }
 

tests/file_test.cpp

@@ -62,11 +62,24 @@ TEST(FileTest, MoveAssignment) {
     ASSERT_TRUE(fs::exists(fst));
 }
 
-TEST(FileTest, Streaming) {
+TEST(FileTest, Write) {
     const auto tmpfile = file();
-    tmpfile << "Hi";
+    tmpfile.write("Hello");
 
-    std::string s;
-    std::fstream(tmpfile.path(), std::ios::in) >> s;
-    ASSERT_EQ(s, "Hi");
+    std::ifstream stream(tmpfile.path());
+    std::string content(std::istreambuf_iterator<char>(stream), {});
+    ASSERT_EQ(content, "Hello");
+}
+
+TEST(FileTest, Append) {
+    const auto tmpfile = file();
+    tmpfile.write("Hello");
+
+    tmpfile.append(", world!");
+
+    std::cout << tmpfile.path() << std::endl;
+
+    std::ifstream stream(tmpfile.path());
+    std::string content(std::istreambuf_iterator<char>(stream), {});
+    ASSERT_EQ(content, "Hello, world!");
 }