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      std::forward_list<T,Allocator>::pop_front

      From cppreference.com
      <cpp‎ |container‎ |forward list

      [edit template]
       
       
       
      std::forward_list
      Member functions
      Non-member functions
      (until C++20)(until C++20)(until C++20)(until C++20)(until C++20)
      Deduction guides(C++17)
       
      void pop_front();
      		(since C++11)
      (constexpr since C++26)

      Removes the first element of the container.

      Ifempty() istrue, the behavior is undefined.

      		(until C++26)

      Ifempty() istrue:

      • If the implementation ishardened, acontract violation occurs. Moreover, if the contract-violation handler returns under “observe” evaluation semantic, the behavior is undefined.
      • If the implementation is not hardened, the behavior is undefined.
      		(since C++26)

      References and iterators to the erased element are invalidated.

      [edit]Complexity

      Constant.

      [edit]Example

      Run this code
      #include <forward_list>#include <iostream> int main(){std::forward_list<char> chars{'A','B','C','D'}; for(;!chars.empty(); chars.pop_front())std::cout<<"chars.front(): '"<< chars.front()<<"'\n";}

      Output:

      chars.front(): 'A'chars.front(): 'B'chars.front(): 'C'chars.front(): 'D'

      [edit]See also

      inserts an element to the beginning
      (public member function)[edit]
      access the first element
      (public member function)[edit]
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/container/forward_list/pop_front&oldid=155983"
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