Fix shadowing (fixes #141)

Author: apolukhin

include/boost/stacktrace/safe_dump_to.hpp

@@ -35,7 +35,7 @@ namespace boost { namespace stacktrace {
 /// @cond
 namespace detail {
 
-    typedef const void* native_frame_ptr_t; // TODO: change to `typedef void(*native_frame_ptr_t)();`
+    using native_frame_ptr_t = const void*;
     enum helper{ max_frames_dump = 128 };
 
     BOOST_STACKTRACE_FUNCTION std::size_t from_dump(const char* filename, native_frame_ptr_t* out_frames);
@@ -52,7 +52,7 @@ struct this_thread_frames { // struct is required to avoid warning about usage o
     BOOST_NOINLINE BOOST_STACKTRACE_FUNCTION static std::size_t collect(native_frame_ptr_t* out_frames, std::size_t max_frames_count, std::size_t skip) noexcept;
 
     BOOST_NOINLINE static std::size_t safe_dump_to_impl(void* memory, std::size_t size, std::size_t skip) noexcept {
-        typedef boost::stacktrace::detail::native_frame_ptr_t native_frame_ptr_t;
+        using boost::stacktrace::detail::native_frame_ptr_t;
 
         if (size < sizeof(native_frame_ptr_t)) {
             return 0;
@@ -66,7 +66,7 @@ struct this_thread_frames { // struct is required to avoid warning about usage o
 
     template <class T>
     BOOST_NOINLINE static std::size_t safe_dump_to_impl(T file, std::size_t skip, std::size_t max_depth) noexcept {
-        typedef boost::stacktrace::detail::native_frame_ptr_t native_frame_ptr_t;
+        using boost::stacktrace::detail::native_frame_ptr_t;
 
         native_frame_ptr_t buffer[boost::stacktrace::detail::max_frames_dump + 1];
         if (max_depth > boost::stacktrace::detail::max_frames_dump) {