From e4adb22fa2b57a90e968bd9c8d83924421b0da70 Mon Sep 17 00:00:00 2001
From: Jinhao <cnjinhao@hotmail.com>
Date: Sat, 9 Apr 2016 05:06:30 +0800
Subject: [PATCH] fix a GCC compiler error

---
 include/nana/gui/widgets/listbox.hpp | 12 ++++++------
 source/gui/widgets/listbox.cpp       |  2 +-
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/nana/gui/widgets/listbox.hpp b/include/nana/gui/widgets/listbox.hpp
index e54b7415..eb6b31d3 100644
--- a/include/nana/gui/widgets/listbox.hpp
+++ b/include/nana/gui/widgets/listbox.hpp
@@ -74,7 +74,7 @@ namespace nana
 				}
 
 				template<typename Type>
-				const typename std::remove_const<Type>::type *get()
+				const typename std::remove_const<Type>::type *get() const
 				{
 					using value_type = typename std::remove_const<Type>::type;
 					auto target = dynamic_cast<real_pointer<value_type>*>(intern_);
@@ -129,7 +129,7 @@ namespace nana
 				virtual void assign(std::size_t pos, const std::vector<cell>& cells) = 0;
 				virtual std::vector<cell> to_cells(std::size_t pos) const = 0;
 
-				virtual bool push_back(const_virtual_pointer&) = 0;
+				virtual bool push_back(const const_virtual_pointer&) = 0;
 
 				virtual void * pointer() = 0;
 				virtual const void* pointer() const = 0;
@@ -214,7 +214,7 @@ namespace nana
 					return translator_.to_cell(container_.at(pos));
 				}
 
-				bool push_back(const_virtual_pointer& dptr) override
+				bool push_back(const const_virtual_pointer& dptr) override
 				{
 					auto value = dptr.get<value_type>();
 					if (value)
@@ -303,7 +303,7 @@ namespace nana
 					return translator_.to_cell(container_.at(pos));
 				}
 
-				bool push_back(const_virtual_pointer& dptr) override
+				bool push_back(const const_virtual_pointer& dptr) override
 				{
 					auto value = dptr.get<value_type>();
 					if (value)
@@ -385,7 +385,7 @@ namespace nana
 					return ctrans_(container_.at(pos));
 				}
 
-				bool push_back(const_virtual_pointer& dptr) override
+				bool push_back(const const_virtual_pointer& dptr) override
 				{
 					throw std::runtime_error("nana::listbox disallow to remove items because of immutable model");
 				}
@@ -997,7 +997,7 @@ namespace nana
 				void inline_factory(size_type column, pat::cloneable<pat::abstract_factory<inline_notifier_interface>> factory);
 			private:
 				void _m_append(std::vector<cell> && cells);
-				void _m_try_append_model(const_virtual_pointer&);
+				void _m_try_append_model(const const_virtual_pointer&);
 				void _m_cat_by_pos();
 				void _m_update();
 				void _m_reset_model(model_interface*);
diff --git a/source/gui/widgets/listbox.cpp b/source/gui/widgets/listbox.cpp
index 0ff2ff24..058dc61c 100644
--- a/source/gui/widgets/listbox.cpp
+++ b/source/gui/widgets/listbox.cpp
@@ -4601,7 +4601,7 @@ namespace nana
 					}
 				}
 
-				void cat_proxy::_m_try_append_model(const_virtual_pointer& dptr)
+				void cat_proxy::_m_try_append_model(const const_virtual_pointer& dptr)
 				{
 					if (!cat_->model_ptr)
 					{