diff --git a/flat_map.hpp b/flat_map.hpp
index 3ad42db..c882c9f 100644
--- a/flat_map.hpp
+++ b/flat_map.hpp
@@ -177,6 +177,51 @@ namespace flat_hpp
         void swap(flat_map& other) {
             //TODO(BlackMat): implme
         }
+
+        size_type count(const key_type& key) const {
+            const auto iter = find(key);
+            return iter != end() ? 1 : 0;
+        }
+
+        iterator find(const key_type& key) {
+            //TODO(BlackMat): implme
+            return end();
+        }
+
+        const_iterator find(const key_type& key) const {
+            //TODO(BlackMat): implme
+            return end();
+        }
+
+        std::pair<iterator, iterator> equal_range(const key_type& key) {
+            //TODO(BlackMat): implme
+            return {end(), end()};
+        }
+
+        std::pair<const_iterator, const_iterator> equal_range(const key_type& key) const {
+            //TODO(BlackMat): implme
+            return {end(), end()};
+        }
+
+        iterator lower_bound(const key_type& key) {
+            //TODO(BlackMat): implme
+            return end();
+        }
+
+        const_iterator lower_bound(const key_type& key) const {
+            //TODO(BlackMat): implme
+            return end();
+        }
+
+        iterator upper_bound(const key_type& key) {
+            //TODO(BlackMat): implme
+            return end();
+        }
+
+        const_iterator upper_bound(const key_type& key) const {
+            //TODO(BlackMat): implme
+            return end();
+        }
     private:
         data_type data_;
         key_compare compare_;
diff --git a/flat_map_tests.cpp b/flat_map_tests.cpp
index 0b8ef77..d1d8283 100644
--- a/flat_map_tests.cpp
+++ b/flat_map_tests.cpp
@@ -27,6 +27,11 @@ namespace
             (void)n;
         }
     };
+
+    template < typename T >
+    constexpr std::add_const_t<T>& my_as_const(T& t) noexcept {
+        return t;
+    }
 }
 
 TEST_CASE("flat_map") {
@@ -134,4 +139,17 @@ TEST_CASE("flat_map") {
         s0.swap(s1);
         swap(s0, s1);
     }
+    SECTION("lookup") {
+        using map_t = flat_map<int, unsigned>;
+        map_t s0;
+        s0.count(10);
+        s0.find(10);
+        my_as_const(s0).find(10);
+        s0.equal_range(20);
+        my_as_const(s0).equal_range(20);
+        s0.lower_bound(30);
+        my_as_const(s0).lower_bound(30);
+        s0.upper_bound(30);
+        my_as_const(s0).upper_bound(30);
+    }
 }
diff --git a/flat_set.hpp b/flat_set.hpp
index 0478ddf..f985ada 100644
--- a/flat_set.hpp
+++ b/flat_set.hpp
@@ -176,6 +176,51 @@ namespace flat_hpp
         void swap(flat_set& other) {
             //TODO(BlackMat): implme
         }
+
+        size_type count(const key_type& key) const {
+            const auto iter = find(key);
+            return iter != end() ? 1 : 0;
+        }
+
+        iterator find(const key_type& key) {
+            //TODO(BlackMat): implme
+            return end();
+        }
+
+        const_iterator find(const key_type& key) const {
+            //TODO(BlackMat): implme
+            return end();
+        }
+
+        std::pair<iterator, iterator> equal_range(const key_type& key) {
+            //TODO(BlackMat): implme
+            return {end(), end()};
+        }
+
+        std::pair<const_iterator, const_iterator> equal_range(const key_type& key) const {
+            //TODO(BlackMat): implme
+            return {end(), end()};
+        }
+
+        iterator lower_bound(const key_type& key) {
+            //TODO(BlackMat): implme
+            return end();
+        }
+
+        const_iterator lower_bound(const key_type& key) const {
+            //TODO(BlackMat): implme
+            return end();
+        }
+
+        iterator upper_bound(const key_type& key) {
+            //TODO(BlackMat): implme
+            return end();
+        }
+
+        const_iterator upper_bound(const key_type& key) const {
+            //TODO(BlackMat): implme
+            return end();
+        }
     private:
         data_type data_;
         key_compare compare_;
diff --git a/flat_set_tests.cpp b/flat_set_tests.cpp
index cea309e..f251a15 100644
--- a/flat_set_tests.cpp
+++ b/flat_set_tests.cpp
@@ -27,6 +27,11 @@ namespace
             (void)n;
         }
     };
+
+    template < typename T >
+    constexpr std::add_const_t<T>& my_as_const(T& t) noexcept {
+        return t;
+    }
 }
 
 TEST_CASE("flat_set") {
@@ -125,4 +130,17 @@ TEST_CASE("flat_set") {
         s0.swap(s1);
         swap(s0, s1);
     }
+    SECTION("lookup") {
+        using set_t = flat_set<int>;
+        set_t s0;
+        s0.count(10);
+        s0.find(10);
+        my_as_const(s0).find(10);
+        s0.equal_range(20);
+        my_as_const(s0).equal_range(20);
+        s0.lower_bound(30);
+        my_as_const(s0).lower_bound(30);
+        s0.upper_bound(30);
+        my_as_const(s0).upper_bound(30);
+    }
 }