Replace boost::optional by std::optional

src/ewig/application.cpp

@@ -47,7 +47,7 @@ static const auto global_commands = commands
     {"page-down",              scroll_command(page_down)},
     {"page-up",                scroll_command(page_up)},
     {"paste",                  paste_command(insert_text)},
-    {"quit",                   [](auto, auto) { return boost::none; }},
+    {"quit",                   [](auto, auto) { return std::nullopt; }},
     {"save",                   save},
     {"undo",                   edit_command(undo)},
     {"start-selection",        edit_command(start_selection)},
@@ -93,7 +93,7 @@ application clear_input(application state)
     return state;
 }
 
-boost::optional<application> update(application state, event ev)
+std::optional<application> update(application state, event ev)
 {
     state.input = state.input.push_back(ev.key);
     const auto& map = state.keys.get();
@@ -116,7 +116,7 @@ boost::optional<application> update(application state, event ev)
     return state;
 }
 
-boost::optional<application>
+std::optional<application>
 eval_command(application state, const std::string& cmd, coord size)
 {
     auto it = global_commands.find(cmd);

src/ewig/application.hpp

@@ -48,17 +48,17 @@ struct event
     coord size;
 };
 
-using command = std::function<boost::optional<application>(application, coord)>;
+using command = std::function<std::optional<application>(application, coord)>;
 
 application save(application app, coord);
 application paste(application app, coord size);
 application put_message(application state, std::string str);
 application put_clipboard(application state, text content);
 
-boost::optional<application> eval_command(application state, const std::string& cmd, coord editor_size);
+std::optional<application> eval_command(application state, const std::string& cmd, coord editor_size);
 
 application clear_input(application state);
-boost::optional<application> update(application state, event ev);
+std::optional<application> update(application state, event ev);
 
 application apply_edit(application state, coord size, buffer edit);
 application apply_edit(application state, coord size, std::pair<buffer, text> edit);

src/ewig/buffer.cpp

@@ -22,7 +22,6 @@
 
 #include <immer/flex_vector_transient.hpp>
 #include <immer/algorithm.hpp>
-#include <boost/optional.hpp>
 
 #include <algorithm>
 #include <fstream>
@@ -370,14 +369,14 @@ std::pair<buffer, text> cut(buffer buf)
         buf.cursor = starts;
     }
 
-    buf.selection_start = boost::none;
+    buf.selection_start = std::nullopt;
     return {buf, selection};
 }
 
 std::pair<buffer, text> copy(buffer buf)
 {
     auto result = selected_text(buf);
-    buf.selection_start = boost::none;
+    buf.selection_start = std::nullopt;
     return {buf, result};
 }
 
@@ -397,7 +396,7 @@ buffer select_whole_buffer(buffer buf)
 
 buffer clear_selection(buffer buf)
 {
-    buf.selection_start = boost::none;
+    buf.selection_start = std::nullopt;
     return buf;
 }
 
@@ -434,7 +433,7 @@ buffer record(buffer before, buffer after)
     if (before.content != after.content) {
         after.history = after.history.push_back({before.content, before.cursor});
         if (before.history_pos == after.history_pos)
-            after.history_pos = boost::none;
+            after.history_pos = std::nullopt;
     }
     return after;
 }

src/ewig/buffer.hpp

@@ -26,7 +26,7 @@
 #include <immer/flex_vector.hpp>
 #include <immer/vector.hpp>
 
-#include <boost/optional.hpp>
+#include <optional>
 
 namespace ewig {
 
@@ -51,9 +51,9 @@ struct buffer
     text content;
     coord cursor;
     coord scroll;
-    boost::optional<coord> selection_start;
+    std::optional<coord> selection_start;
     immer::vector<snapshot> history;
-    boost::optional<std::size_t> history_pos;
+    std::optional<std::size_t> history_pos;
 };
 
 constexpr auto tab_width = 8;

src/ewig/utils.hpp

@@ -24,8 +24,8 @@
 
 #include <boost/fusion/adapted/std_tuple.hpp>
 #include <boost/functional/hash.hpp>
-#include <boost/optional.hpp>
 
+#include <optional>
 #include <tuple>
 
 namespace std
@@ -54,7 +54,7 @@ struct hash<immer::vector<T>>
 namespace ewig {
 
 template <typename T, typename Fn>
-boost::optional<T> optional_map(boost::optional<T> v, Fn&& fn)
+std::optional<T> optional_map(std::optional<T> v, Fn&& fn)
 {
     return v ? std::forward<Fn>(fn)(std::move(*v)) : v;
 }