add contains function #25

headers/flat.hpp/flat_map.hpp

@@ -508,6 +508,18 @@ namespace flat_hpp
                 : end();
         }
 
+        bool contains(const key_type& key) const {
+            return find(key) != end();
+        }
+
+        template < typename K >
+        std::enable_if_t<
+            detail::is_transparent_v<Compare, K>,
+            bool>
+        contains(const K& key) const {
+            return find(key) != end();
+        }
+
         std::pair<iterator, iterator> equal_range(const key_type& key) {
             const base_type& comp = *this;
             return std::equal_range(begin(), end(), key, comp);

headers/flat.hpp/flat_multimap.hpp

@@ -458,6 +458,18 @@ namespace flat_hpp
                 : end();
         }
 
+        bool contains(const key_type& key) const {
+            return find(key) != end();
+        }
+
+        template < typename K >
+        std::enable_if_t<
+            detail::is_transparent_v<Compare, K>,
+            bool>
+        contains(const K& key) const {
+            return find(key) != end();
+        }
+
         std::pair<iterator, iterator> equal_range(const key_type& key) {
             const base_type& comp = *this;
             return std::equal_range(begin(), end(), key, comp);

headers/flat.hpp/flat_multiset.hpp

@@ -386,6 +386,18 @@ namespace flat_hpp
                 : end();
         }
 
+        bool contains(const key_type& key) const {
+            return find(key) != end();
+        }
+
+        template < typename K >
+        std::enable_if_t<
+            detail::is_transparent_v<Compare, K>,
+            bool>
+        contains(const K& key) const {
+            return find(key) != end();
+        }
+
         std::pair<iterator, iterator> equal_range(const key_type& key) {
             return std::equal_range(begin(), end(), key, key_comp());
         }

headers/flat.hpp/flat_set.hpp

@@ -436,6 +436,18 @@ namespace flat_hpp
                 : end();
         }
 
+        bool contains(const key_type& key) const {
+            return find(key) != end();
+        }
+
+        template < typename K >
+        std::enable_if_t<
+            detail::is_transparent_v<Compare, K>,
+            bool>
+        contains(const K& key) const {
+            return find(key) != end();
+        }
+
         std::pair<iterator, iterator> equal_range(const key_type& key) {
             return std::equal_range(begin(), end(), key, key_comp());
         }

untests/flat_map_tests.cpp

@@ -421,6 +421,9 @@ TEST_CASE("flat_map") {
             REQUIRE(my_as_const(s0).find(3) == s0.cbegin() + 2);
             REQUIRE(s0.find(6) == s0.end());
             REQUIRE(my_as_const(s0).find(0) == s0.cend());
+            REQUIRE(my_as_const(s0).contains(1));
+            REQUIRE(my_as_const(s0).contains(3));
+            REQUIRE_FALSE(my_as_const(s0).contains(0));
         }
         {
             map_t s0{{1,2},{2,3},{3,4},{4,5},{5,6}};
@@ -445,6 +448,9 @@ TEST_CASE("flat_map") {
         REQUIRE(s0.find(std::string_view("42")) == s0.end());
         REQUIRE(my_as_const(s0).find(std::string_view("42")) == s0.cend());
 
+        REQUIRE(my_as_const(s0).contains(std::string_view("hello")));
+        REQUIRE_FALSE(my_as_const(s0).contains(std::string_view("42")));
+
         REQUIRE(my_as_const(s0).count(std::string_view("hello")) == 1);
         REQUIRE(my_as_const(s0).count(std::string_view("hello_42")) == 0);
 

untests/flat_multimap_tests.cpp

@@ -423,6 +423,9 @@ TEST_CASE("flat_multimap") {
             REQUIRE(my_as_const(s0).find(3) == s0.cbegin() + 2);
             REQUIRE(s0.find(6) == s0.end());
             REQUIRE(my_as_const(s0).find(0) == s0.cend());
+            REQUIRE(my_as_const(s0).contains(1));
+            REQUIRE(my_as_const(s0).contains(3));
+            REQUIRE_FALSE(my_as_const(s0).contains(0));
         }
         {
             map_t s0{{1,2},{2,3},{2,1},{3,4},{4,5},{5,6}};
@@ -447,6 +450,9 @@ TEST_CASE("flat_multimap") {
         REQUIRE(s0.find(std::string_view("42")) == s0.end());
         REQUIRE(my_as_const(s0).find(std::string_view("42")) == s0.cend());
 
+        REQUIRE(my_as_const(s0).contains(std::string_view("hello")));
+        REQUIRE_FALSE(my_as_const(s0).contains(std::string_view("42")));
+
         REQUIRE(my_as_const(s0).count(std::string_view("hello")) == 1);
         REQUIRE(my_as_const(s0).count(std::string_view("hello_42")) == 0);
 

untests/flat_multiset_tests.cpp

@@ -399,6 +399,9 @@ TEST_CASE("flat_multiset") {
             REQUIRE(my_as_const(s0).find(3) == s0.cbegin() + 2);
             REQUIRE(s0.find(6) == s0.end());
             REQUIRE(my_as_const(s0).find(0) == s0.cend());
+            REQUIRE(my_as_const(s0).contains(1));
+            REQUIRE(my_as_const(s0).contains(3));
+            REQUIRE_FALSE(my_as_const(s0).contains(0));
         }
         {
             set_t s0{1,2,3,3,4,5};
@@ -423,6 +426,9 @@ TEST_CASE("flat_multiset") {
         REQUIRE(s0.find(std::string_view("42")) == s0.end());
         REQUIRE(my_as_const(s0).find(std::string_view("42")) == s0.cend());
 
+        REQUIRE(my_as_const(s0).contains(std::string_view("hello")));
+        REQUIRE_FALSE(my_as_const(s0).contains(std::string_view("42")));
+
         REQUIRE(my_as_const(s0).count(std::string_view("hello")) == 1);
         REQUIRE(my_as_const(s0).count(std::string_view("hello_42")) == 0);
 

untests/flat_set_tests.cpp

@@ -397,6 +397,9 @@ TEST_CASE("flat_set") {
             REQUIRE(my_as_const(s0).find(3) == s0.cbegin() + 2);
             REQUIRE(s0.find(6) == s0.end());
             REQUIRE(my_as_const(s0).find(0) == s0.cend());
+            REQUIRE(my_as_const(s0).contains(1));
+            REQUIRE(my_as_const(s0).contains(3));
+            REQUIRE_FALSE(my_as_const(s0).contains(0));
         }
         {
             set_t s0{1,2,3,4,5};
@@ -421,6 +424,9 @@ TEST_CASE("flat_set") {
         REQUIRE(s0.find(std::string_view("42")) == s0.end());
         REQUIRE(my_as_const(s0).find(std::string_view("42")) == s0.cend());
 
+        REQUIRE(my_as_const(s0).contains(std::string_view("hello")));
+        REQUIRE_FALSE(my_as_const(s0).contains(std::string_view("42")));
+
         REQUIRE(my_as_const(s0).count(std::string_view("hello")) == 1);
         REQUIRE(my_as_const(s0).count(std::string_view("hello_42")) == 0);