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Showing content from https://timsong-cpp.github.io/cppwp/n4659/func.wrap.badcall below:

[func.wrap.badcall]

23 General utilities library [utilities] 23.14 Function objects [function.objects] 23.14.13 Polymorphic function wrappers [func.wrap] 23.14.13.1 Class bad_­function_­call [func.wrap.badcall] 1 #

An exception of type bad_­function_­call is thrown by function​::​operator() ([func.wrap.func.inv]) when the function wrapper object has no target.

namespace std {
  class bad_function_call : public exception {
  public:
    // [func.wrap.badcall.const], constructor
    bad_function_call() noexcept;
  };
}
23.14.13.1.1 bad_­function_­call constructor [func.wrap.badcall.const]

bad_function_call() noexcept;

1 #

Effects: Constructs a bad_­function_­call object.

2 #

Postconditions: what() returns an implementation-defined ntbs.


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