Further boost cleanup

* Removed more unnecessary includes
* Used std::swap instead of boost::swap in fake_unit_ptr. This is since unit_ptr (the type of `unit_` here)
  is now just a shared_ptr instead of a boost::intrusive_ptr.
* Used std::gcd instead of boost::integer::gcd

src/chat_events.cpp

@@ -22,8 +22,6 @@
 #include "preferences/general.hpp"
 #include "preferences/game.hpp"
 
-#include <boost/range/algorithm/find_if.hpp>
-
 static lg::log_domain log_engine("engine");
 #define ERR_NG LOG_STREAM(err, log_engine)
 #define LOG_NG LOG_STREAM(info, log_engine)

src/config_attribute_value.hpp

@@ -41,9 +41,6 @@
 #include <type_traits>
 #include <memory>
 
-#include <boost/exception/exception.hpp>
-#include <boost/range/iterator_range.hpp>
-
 class enum_tag;
 
 /**

src/fake_unit_ptr.cpp

@@ -19,8 +19,6 @@
 #include "units/unit.hpp"
 #include "units/ptr.hpp"
 
-#include <boost/swap.hpp>
-
 fake_unit_ptr::fake_unit_ptr() : unit_(), my_manager_(nullptr) {}
 fake_unit_ptr::fake_unit_ptr(const internal_ptr & u) : unit_(u), my_manager_(nullptr) {}
 fake_unit_ptr::fake_unit_ptr(const internal_ptr & u, fake_unit_manager * mgr) : unit_(u), my_manager_(nullptr)
@@ -40,7 +38,7 @@ fake_unit_ptr::fake_unit_ptr(fake_unit_ptr && ptr)
 }
 
 void fake_unit_ptr::swap (fake_unit_ptr & o) {
-	boost::swap(unit_, o.unit_);
+	std::swap(unit_, o.unit_);
 	std::swap(my_manager_, o.my_manager_);
 }
 

src/gui/dialogs/preferences_dialog.cpp

@@ -57,13 +57,8 @@
 #include "gui/widgets/toggle_button.hpp"
 #include "gui/widgets/window.hpp"
 
-#if BOOST_VERSION >= 106700
-#include <boost/integer/common_factor_rt.hpp>
-#else
-#include <boost/math/common_factor_rt.hpp>
-#endif
-
 #include <functional>
+#include <numeric>
 
 namespace gui2
 {
@@ -142,12 +137,7 @@ void preferences_dialog::set_resolution_list(menu_button& res_list)
 		config option;
 		option["label"] = formatter() << res.x << font::unicode_multiplication_sign << res.y;
 
-#if BOOST_VERSION >= 106700
-		const int div = boost::integer::gcd(res.x, res.y);
-#else
-		const int div = boost::math::gcd(res.x, res.y);
-#endif
-
+		const int div = std::gcd(12, 4);
 		const int x_ratio = res.x / div;
 		const int y_ratio = res.y / div;
 

src/gui/widgets/slider.cpp

@@ -29,12 +29,7 @@
 #include "wml_exception.hpp"
 
 #include <functional>
-
-#if BOOST_VERSION >= 106700
-#include <boost/integer/common_factor_rt.hpp>
-#else
-#include <boost/math/common_factor_rt.hpp>
-#endif
+#include <numeric>
 
 #define LOG_SCOPE_HEADER get_control_type() + " [" + id() + "] " + __func__
 #define LOG_HEADER LOG_SCOPE_HEADER + ':'
@@ -265,12 +260,7 @@ void slider::set_value_range(int min_value, int max_value)
 	int diff = max_value - min_value;
 	int old_value = get_value();
 
-#if BOOST_VERSION >= 106700
-	step_size_ = boost::integer::gcd(diff, step_size_);
-#else
-	step_size_ = boost::math::gcd(diff, step_size_);
-#endif
-
+	step_size_ = std::gcd(diff, step_size_);
 	minimum_value_ = min_value;
 
 	slider_set_item_last(diff / step_size_);
@@ -289,11 +279,8 @@ void slider::set_step_size(int step_size)
 	const int range_diff = get_item_count() - 1;
 	const int old_value = get_value();
 
-#if BOOST_VERSION >= 106700
-	step_size_ = boost::integer::gcd(range_diff, step_size);
-#else
-	step_size_ = boost::math::gcd(range_diff, step_size);
-#endif
+	step_size_ = std::gcd(range_diff, step_size);
+
 	slider_set_item_last(range_diff / step_size_);
 	set_value(old_value);
 

src/log.cpp

@@ -21,12 +21,11 @@
 
 #include "log.hpp"
 
-#include <boost/date_time.hpp>
-
 #include <map>
 #include <sstream>
 #include <ctime>
 #include <mutex>
+#include <iomanip>
 
 namespace {
 

src/team.cpp

@@ -35,8 +35,6 @@
 #include "units/types.hpp"
 #include "whiteboard/side_actions.hpp"
 
-#include <boost/dynamic_bitset.hpp>
-
 static lg::log_domain log_engine("engine");
 #define DBG_NG LOG_STREAM(debug, log_engine)
 #define LOG_NG LOG_STREAM(info, log_engine)