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  1. #include <functional>
  2.  
  3. template<bool B>
  4. void wut(std::function<void()> f = []() {})
  5. {
  6.     f();
  7. }
  8.  
  9. int main() {
  10.     wut<false>(); // works
  11.     wut<false>(); // still works
  12.     wut<true>();  // error
  13.     return 0;
  14. }
  15.  
Compilation error #stdin compilation error #stdout 0s 15232KB
comments (?)
stdin 
Standard input is empty
compilation info 
{standard input}: Assembler messages:
{standard input}:37: Error: symbol `_ZNSt14_Function_base13_Base_managerIUlvE_E10_M_managerERSt9_Any_dataRKS3_St18_Manager_operation' is already defined
{standard input}:60: Error: symbol `_ZNSt17_Function_handlerIFvvEUlvE_E9_M_invokeERKSt9_Any_data' is already defined
stdout 
Standard output is empty
https://ideone.com/VlVcUv
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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