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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <functional>
  4. #include <map>
  5. #include <string>
  6. #include <vector>
  7.  
  8. int main()
  9. {
  10.     using namespace std::placeholders;
  11.  
  12.     std::map<std::string, int> karta;
  13.     std::vector<std::string> goroda{ "foo", "bar", "foo" };
  14.  
  15.     std::for_each(goroda.begin(), goroda.end(), std::bind(
  16.         static_cast<
  17.             std::pair<decltype(karta)::iterator, bool>
  18.             (decltype(karta)::*)(const decltype(karta)::key_type&, decltype(karta)::mapped_type&&)>
  19.                 (&decltype(karta)::insert_or_assign),
  20.         std::ref(karta),
  21.         _1,
  22.         std::bind(
  23.             std::plus<decltype(karta)::mapped_type>(),
  24.             1,
  25.             std::bind(
  26.                 static_cast<decltype(karta)::mapped_type&(decltype(karta)::*)(const decltype(karta)::key_type &)>
  27.                 (&decltype(karta)::operator[]),
  28.                 std::ref(karta),
  29.                 _1))
  30.     ));
  31.     std::cout << "foo: " << karta["foo"] << "\nbar: " << karta["bar"] << '\n';
  32.  
  33.     return EXIT_SUCCESS;
  34. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.cpp: In function ‘int main()’:
prog.cpp:19:19: error: ‘insert_or_assign’ is not a member of ‘std::map<std::__cxx11::basic_string<char>, int>’
                 (&decltype(karta)::insert_or_assign),
                   ^~~~~~~~
stdout
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Standard output is empty
https://ideone.com/fi12E8
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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