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  1. #include <functional>
  2.  
  3. void foo(int){}
  4.  
  5. int main(){
  6.   // assume 'std::function' uses 'ArgTypes&&...' in 'operator()'
  7.   std::function<void(int)> f(foo);
  8.   // 'f's 'operator()' will be instantiated as
  9.   // 'void operator()(int&&)'
  10.   // which will only accept rvalues
  11.   int i = 5;
  12.   f(i); // error
  13.   f(5); // OK, '5' is an rvalue
  14. }
Success #stdin #stdout 0s 2848KB
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https://ideone.com/7TyCB8
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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