Make DynamicRegister statically dispatch to its function

src/main.cc

@@ -145,29 +145,28 @@ void register_registers()
         register_manager.add_register(c, make_unique<StaticRegister>());
 
     using StringList = Vector<String, MemoryDomain::Registers>;
-    static const struct {
+
-        char name;
+    register_manager.add_register('%', make_dyn_reg(
-        StringList (*func)(const Context&);
+        [](const Context& context)
-    } dyn_regs[] = {
+        { return StringList{{context.buffer().display_name()}}; }));
-        { '%', [](const Context& context) { return StringList{{context.buffer().display_name()}}; } },
+
-        { '.', [](const Context& context) {
+    register_manager.add_register('.', make_dyn_reg(
+        [](const Context& context) {
             auto content = context.selections_content();
             return StringList{content.begin(), content.end()};
-        } },
+         }));
-        { '#', [](const Context& context) {
+
+    register_manager.add_register('#', make_dyn_reg(
+        [](const Context& context) {
             StringList res;
             for (size_t i = 1; i < context.selections().size()+1; ++i)
                 res.push_back(to_string((int)i));
             return res;
-        } }
+        }));
-    };
-
-    for (auto& dyn_reg : dyn_regs)
-        register_manager.add_register(dyn_reg.name, make_unique<DynamicRegister>(dyn_reg.func));
 
     for (size_t i = 0; i < 10; ++i)
     {
-        register_manager.add_register('0'+i, make_unique<DynamicRegister>(
+        register_manager.add_register('0'+i, make_dyn_reg(
             [i](const Context& context) {
                 StringList result;
                 for (auto& sel : context.selections())

src/register_manager.hh

@@ -8,8 +8,6 @@
 #include "string.hh"
 #include "vector.hh"
 
-#include <functional>
-
 namespace Kakoune
 {
 
@@ -46,14 +44,13 @@ protected:
     Vector<String, MemoryDomain::Registers> m_content;
 };
 
-using RegisterRetriever = std::function<Vector<String, MemoryDomain::Registers> (const Context&)>;
-
 // Dynamic value register, use it's RegisterRetriever
 // to get it's value when needed.
+template<typename Func>
 class DynamicRegister : public StaticRegister
 {
 public:
-    DynamicRegister(RegisterRetriever function)
+    DynamicRegister(Func function)
         : m_function(std::move(function)) {}
 
     Register& operator=(ConstArrayView<String> values) override
@@ -68,9 +65,15 @@ public:
     }
 
 private:
-    RegisterRetriever m_function;
+    Func m_function;
 };
 
+template<typename Func>
+std::unique_ptr<Register> make_dyn_reg(Func func)
+{
+    return make_unique<DynamicRegister<Func>>(std::move(func));
+}
+
 class NullRegister : public Register
 {
 public: