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  1. # include <map>
  2. # include <iostream>
  3.  
  4. struct node {
  5.     int test;
  6. } temp;
  7.  
  8. int main() {
  9.     temp.test = 24;
  10.  
  11.     auto comp = [](const node& n1, const node& n2) { return n1.test < n2.test; };
  12.     std::map<node, bool, decltype(comp)> mymap1(comp);
  13.  
  14.     mymap1.insert(std::make_pair(temp, true));
  15.     mymap1.emplace(node({ 48 }), true);
  16.     mymap1[{ 12 }] = false;
  17.  
  18.     for (auto const &n : mymap1)
  19.         std::cout << n.first.test << ": " << n.second << std::endl;
  20.  
  21.     /*
  22.     // C++17 allows to use range-based for loops together with structured bindings.
  23.     for (auto const &[k, v] : mymap1)
  24.         std::cout << k.test << ": " << v << std::endl;
  25.     */
  26.  
  27. 	return 0;
  28. }
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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12: 0
24: 1
48: 1
https://ideone.com/viMkKc
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
secret

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