refactor: Avoid temporary objects

src/cli/trmn_graph_vt.cpp

@@ -119,73 +119,75 @@ void use_vt(board_t& tromino_board, std::ostream& os) noexcept
 
  init_board(tromino_board);
 
- using std::string_literals::operator""s;
  // clang-format off
- os << ""s +
+ os
  // Set icon and window title
- ESC + "]0;"s + "Tromino Puzzle"s + BEL +
+ << ESC << "]0;" << TITLE << BEL
 
  // Advanced video option (AVO)
- CSI + "?1;2c"s +
+ << CSI << "?1;2c"
 
  // Column mode: 120 * 132 Col
- CSI + "?3h"s +
+ << CSI << "?3h"
 
  // Enter the alternate buffer
- CSI + "?1049h"s +
+ << CSI << "?1049h"
 
  // Mode 320 * 200 color (256-color graphics)
- CSI + "=19h"s +
+ << CSI << "=19h"
 
  // Make cursor invisible
- CSI + "?25l"s +
+ << CSI << "?25l"
 
  // Disable line wrapping
- CSI + "=7l"s +
+ << CSI << "=7l"
 
  // Relative origin mode
- CSI + "?6h"s +
+ << CSI << "?6h"
 
  // Resize the window
- CSI + "8;132;132t"s +
+ << CSI << "8;132;132t"
 
  // Clears the entire screen
- CSI + "2J"s +
+ << CSI << "2J"
 
  // Set board background color
- CSI + "48;5;"s +
- BOARD_BACKGROUND_COLOR + "m"s;
+ << CSI << "48;5;" << BOARD_BACKGROUND_COLOR << "m";
  // clang-format on
 
  draw_board(tromino_board, os);
 
  // clang-format off
- os <<
+ os
  // Set bold mode
- CSI + "1m"s +
+ << CSI << "1m"
 
  // Set mark background color
- CSI + "48;5;"s + MARK_BACKGROUND_COLOR + "m"s +
+ << CSI << "48;5;" << MARK_BACKGROUND_COLOR << "m"
 
  // Set mark foreground color
- CSI + "38;5;"s + MARK_FOREGROUND_COLOR + "m"s;
+ << CSI << "38;5;" << MARK_FOREGROUND_COLOR << "m"
+
+ ;
  // clang-format on
 
  draw_at(tromino_board.mark_x + 1, tromino_board.mark_y + 1, MARK, os);
 
  // clang-format off
- os <<
+ os
  // Set tromino background color
- CSI + "48;5;"s + TROMINO_BACKGROUND_COLOR + "m"s +
+ << CSI << "48;5;" << TROMINO_BACKGROUND_COLOR << "m"
 
  // Set tromino foreground color
- CSI + "38;5;"s + TROMINO_FOREGROUND_COLOR + "m"s;
- // clang-format on
+ << CSI << "38;5;" << TROMINO_FOREGROUND_COLOR << "m"
 
 #ifndef TROMINO_USE_ASCII
- // Use VT100 Special graphics characters
- os << ESC + "(0"s;
-#endif // !TROMINO_USE_ASCII
+ // Use VT100 Special graphics characters
+ << ESC << "(0"
+#endif // not TROMINO_USE_ASCII
+
+ ;
+ // clang-format on
 
  os << std::flush;
 
@@ -205,15 +207,17 @@ void use_vt(board_t& tromino_board, std::ostream& os) noexcept
  std::cin.get();
 
  // clang-format off
- os <<
+ os
  // Switch back VT100 Special graphics characters
- ESC + "0)"s +
+ << ESC << "0)"
 
  // Reset to initial state (RIS)
- ESC + "c"s +
+ << ESC << "c"
 
  // Exit the alternate buffer
- CSI + "?1049l"s;
+ << CSI << "?1049l"
+
+ ;
  // clang-format on
 
  os << std::flush;

src/cli/trmn_graph_vt.hpp

@@ -21,6 +21,8 @@
 
 namespace tromino::cli::vt {
 
+constexpr char const* const TITLE{"Tromino Puzzle"};
+
 constexpr char const* const BEL{"\a"};
 constexpr char const* const ESC{"\x1b"};
 constexpr char const* const CSI{