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  1. #include <set>
  2. #include <functional>
  3. struct A {
  4.   int a;
  5.   // 以下の mutable と const は外すとコンパイルエラー
  6.   mutable std::function<const A*()> f; 
  7.   A(int a) : a(a) { }
  8.   bool operator<(A x) const { return a < x.a; }
  9. };
  10. int main() {
  11.   std::set<A> S;
  12.   std::set<A>::iterator x = S.insert(A(0)).first;
  13.   x->f = [&] { return &*x; };
  14. }
  15.  
  16.  
Success #stdin #stdout 0s 4360KB
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https://ideone.com/UvDwbb
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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