{"id":248517,"date":"2024-06-02T12:16:41","date_gmt":"2024-06-02T12:16:41","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/?p=248517"},"modified":"2024-06-02T12:16:41","modified_gmt":"2024-06-02T12:16:41","slug":"what-does-map-return-if-it-doesn%ca%bct-find-value-in-c-2","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/what-does-map-return-if-it-doesn%ca%bct-find-value-in-c-2\/","title":{"rendered":"What does map return if it doesn\u02bct find value in C++?"},"content":{"rendered":"<p>C++ is a powerful programming language that provides several data structures to efficiently store and retrieve data. One commonly used data structure is the map, which is an associative container that stores elements in key-value pairs and provides fast retrieval based on the key. However, what happens when we search for a value in a map that does not exist? Let&#8217;s explore what map returns in such scenarios and address some related frequently asked questions.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_62 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/namso-gen.co\/blog\/what-does-map-return-if-it-doesn%ca%bct-find-value-in-c-2\/#What_is_a_map_in_C\" title=\"What is a map in C++?\">What is a map in C++?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/namso-gen.co\/blog\/what-does-map-return-if-it-doesn%ca%bct-find-value-in-c-2\/#How_does_the_map_data_structure_work\" title=\"How does the map data structure work?\">How does the map data structure work?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/namso-gen.co\/blog\/what-does-map-return-if-it-doesn%ca%bct-find-value-in-c-2\/#What_does_map_find_do_in_C\" title=\"What does map::find() do in C++?\">What does map::find() do in C++?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/namso-gen.co\/blog\/what-does-map-return-if-it-doesn%ca%bct-find-value-in-c-2\/#What_does_map_operator_return_if_the_key_is_not_found\" title=\"What does map::operator[] return if the key is not found?\">What does map::operator[] return if the key is not found?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/namso-gen.co\/blog\/what-does-map-return-if-it-doesn%ca%bct-find-value-in-c-2\/#What_does_map_at_return_if_the_key_is_not_found\" title=\"What does map::at() return if the key is not found?\">What does map::at() return if the key is not found?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/namso-gen.co\/blog\/what-does-map-return-if-it-doesn%ca%bct-find-value-in-c-2\/#What_does_map_count_return_if_the_key_is_not_found\" title=\"What does map::count() return if the key is not found?\">What does map::count() return if the key is not found?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/namso-gen.co\/blog\/what-does-map-return-if-it-doesn%ca%bct-find-value-in-c-2\/#What_does_map_lower_bound_return_if_the_key_is_not_found\" title=\"What does map::lower_bound() return if the key is not found?\">What does map::lower_bound() return if the key is not found?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/namso-gen.co\/blog\/what-does-map-return-if-it-doesn%ca%bct-find-value-in-c-2\/#What_does_map_upper_bound_return_if_the_key_is_not_found\" title=\"What does map::upper_bound() return if the key is not found?\">What does map::upper_bound() return if the key is not found?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/namso-gen.co\/blog\/what-does-map-return-if-it-doesn%ca%bct-find-value-in-c-2\/#What_does_map_equal_range_return_if_the_key_is_not_found\" title=\"What does map::equal_range() return if the key is not found?\">What does map::equal_range() return if the key is not found?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/namso-gen.co\/blog\/what-does-map-return-if-it-doesn%ca%bct-find-value-in-c-2\/#What_does_map_return_if_it_doesn%CA%BCt_find_value_in_C\" title=\"What does map return if it doesn\u02bct find value in C++?\">What does map return if it doesn\u02bct find value in C++?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/namso-gen.co\/blog\/what-does-map-return-if-it-doesn%ca%bct-find-value-in-c-2\/#Can_a_map_contain_duplicate_keys\" title=\"Can a map contain duplicate keys?\">Can a map contain duplicate keys?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/namso-gen.co\/blog\/what-does-map-return-if-it-doesn%ca%bct-find-value-in-c-2\/#Can_I_modify_the_value_of_an_element_that_is_not_found_in_a_map\" title=\"Can I modify the value of an element that is not found in a map?\">Can I modify the value of an element that is not found in a map?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/namso-gen.co\/blog\/what-does-map-return-if-it-doesn%ca%bct-find-value-in-c-2\/#How_can_I_check_if_a_key_exists_in_a_map\" title=\"How can I check if a key exists in a map?\">How can I check if a key exists in a map?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/namso-gen.co\/blog\/what-does-map-return-if-it-doesn%ca%bct-find-value-in-c-2\/#What_is_the_difference_between_map_find_and_map_count\" title=\"What is the difference between map::find() and map::count()?\">What is the difference between map::find() and map::count()?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/namso-gen.co\/blog\/what-does-map-return-if-it-doesn%ca%bct-find-value-in-c-2\/#Can_I_use_custom_types_as_keys_in_a_map\" title=\"Can I use custom types as keys in a map?\">Can I use custom types as keys in a map?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/namso-gen.co\/blog\/what-does-map-return-if-it-doesn%ca%bct-find-value-in-c-2\/#What_happens_if_I_search_for_a_value_in_an_empty_map\" title=\"What happens if I search for a value in an empty map?\">What happens if I search for a value in an empty map?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"What_is_a_map_in_C\"><\/span>What is a map in C++?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nA map is an associative container in C++ that stores key-value pairs, allowing fast access to elements based on their keys.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_does_the_map_data_structure_work\"><\/span>How does the map data structure work?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nA map uses a balanced binary search tree, typically a red-black tree, to efficiently organize its elements by their keys. This allows logarithmic time complexity for operations like inserting, erasing, and searching for elements.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_does_map_find_do_in_C\"><\/span>What does map::find() do in C++?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nThe map::find() function searches for an element with a given key in the map. If the key is found, it returns an iterator pointing to the element; otherwise, it returns an iterator pointing to the element that would follow the last element in the map.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_does_map_operator_return_if_the_key_is_not_found\"><\/span>What does map::operator[] return if the key is not found?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nIf the key is not found in the map and map::operator[] is used, it adds a new element to the map with the given key, and the corresponding value is value-initialized (for example, zero for integral types or empty for strings).<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_does_map_at_return_if_the_key_is_not_found\"><\/span>What does map::at() return if the key is not found?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nIf the key is not found in the map and map::at() is used, it throws an exception of type std::out_of_range.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_does_map_count_return_if_the_key_is_not_found\"><\/span>What does map::count() return if the key is not found?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nThe map::count() function returns the number of elements with a given key in the map, which can only be either 0 or 1 since maps do not allow duplicate keys.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_does_map_lower_bound_return_if_the_key_is_not_found\"><\/span>What does map::lower_bound() return if the key is not found?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nThe map::lower_bound() function returns an iterator pointing to the first element in the map that is not less than the given key. If the key is not found, it returns an iterator pointing to the element that would follow the last element in the map.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_does_map_upper_bound_return_if_the_key_is_not_found\"><\/span>What does map::upper_bound() return if the key is not found?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nThe map::upper_bound() function returns an iterator pointing to the first element in the map that is greater than the given key. If the key is not found, it returns an iterator pointing to the element that would follow the last element in the map.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_does_map_equal_range_return_if_the_key_is_not_found\"><\/span>What does map::equal_range() return if the key is not found?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nThe map::equal_range() function returns a pair of iterators. The first iterator denotes the lower bound of the range of elements with a key equivalent to the given key, and the second iterator denotes the upper bound. If the key is not found, both iterators will be equal and point to the element that would follow the last element in the map.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_does_map_return_if_it_doesn%CA%BCt_find_value_in_C\"><\/span><b>What does map return if it doesn\u02bct find value in C++?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\nWhen a value is not found in a map using functions like map::find(), map::lower_bound(), map::upper_bound(), or map::equal_range(), the return value is an iterator pointing to the element that would follow the last element in the map. This indicates that the key does not exist in the map.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_a_map_contain_duplicate_keys\"><\/span>Can a map contain duplicate keys?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, a map does not allow duplicate keys. Each key in a map must be unique.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_I_modify_the_value_of_an_element_that_is_not_found_in_a_map\"><\/span>Can I modify the value of an element that is not found in a map?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, attempting to modify the value of an element that is not found in a map will result in the insertion of a new element with the given key and the corresponding value.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_can_I_check_if_a_key_exists_in_a_map\"><\/span>How can I check if a key exists in a map?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYou can use the map::count() function to check if a key exists in a map. If the count is 0, the key does not exist; otherwise, it exists.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_is_the_difference_between_map_find_and_map_count\"><\/span>What is the difference between map::find() and map::count()?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nmap::find() returns an iterator pointing to the found element or the element that would follow the last element, while map::count() returns the number of elements with the given key (0 or 1 in case of a map).<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_I_use_custom_types_as_keys_in_a_map\"><\/span>Can I use custom types as keys in a map?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, you can use custom types as keys in a map. However, you need to provide a comparison function or overload the comparison operators (operator< or operator>) to establish a strict weak ordering between the keys.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_happens_if_I_search_for_a_value_in_an_empty_map\"><\/span>What happens if I search for a value in an empty map?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nIf you search for a value in an empty map using functions like map::find() or map::lower_bound(), the returned iterator will be equal to map::end(), indicating that the key was not found in the empty map.<\/p>\n<p>In conclusion, when a value is not found in a C++ map, various functions return an iterator pointing to the element that would follow the last element in the map. This distinct return value serves as an indicator that the searched-for value does not exist in the map.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C++ is a powerful programming language that provides several data structures to efficiently store and retrieve data. One commonly used data structure is the map, which is an associative container that stores elements in key-value pairs and provides fast retrieval based on the key. However, what happens when we search for a value in a &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"What does map return if it doesn\u02bct find value in C++?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/what-does-map-return-if-it-doesn%ca%bct-find-value-in-c-2\/#more-248517\">Read more<span class=\"screen-reader-text\">What does map return if it doesn\u02bct find value in C++?<\/span><\/a><\/p>\n","protected":false},"author":63,"featured_media":107420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86279],"tags":[],"class_list":["post-248517","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What does map return if it doesn\u02bct find value in C++?<\/title>\n<meta name=\"description\" content=\"C++ is a powerful programming language that provides several data structures to efficiently store and retrieve data. 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