diff --git a/header/algorithm.hpp b/header/algorithm.hpp
index eaa0711..774b99a 100644
--- a/header/algorithm.hpp
+++ b/header/algorithm.hpp
@@ -23,15 +23,6 @@ namespace util {
             void operator()(T* p) { delete p; }
         };
 
-        // for binary operation
-        struct raw_type { char c; };
-        inline std::istream& operator >>(std::istream& in, raw_type& r) {
-            return in.get(r.c);
-        }
-        inline std::ostream& operator <<(std::ostream& out, const raw_type& r) {
-            return out.put(r.c);
-        }
-
         // copy_if
         template<   typename InputIterator, typename OstreamIterator,
                     typename Predicate>
diff --git a/sample/algorithm/main.cpp b/sample/algorithm/main.cpp
index 7207422..03edf42 100644
--- a/sample/algorithm/main.cpp
+++ b/sample/algorithm/main.cpp
@@ -110,11 +110,6 @@ int main(const int argc, const char* const argv[]) {
             util::algorithm::basic_progress<std::string, unsigned int>(
                 std::cerr, 1, params.size()));
 
-    std::cout << "binary operation\n";
-    std::ifstream fin("main.cpp", std::ios_base::binary);
-    std::istream_iterator<util::algorithm::raw_type> iitr(fin), end;
-    util::algorithm::print<util::algorithm::raw_type>(iitr, end, std::cout, "");
-
     std::cerr << std::endl;
 
     return 0;