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      std::ranges::pop_heap

      From cppreference.com
      <cpp‎ |algorithm‎ |ranges
       
       
      Algorithm library
      Constrained algorithms and algorithms on ranges(C++20)
      Constrained algorithms, e.g.ranges::copy,ranges::sort, ...
      Execution policies(C++17)
      Sorting and related operations
      Partitioning operations
      Sorting operations
      Binary search operations
      (on partitioned ranges)
      Set operations (on sorted ranges)
      Merge operations (on sorted ranges)
      Heap operations
      Minimum/maximum operations
      (C++11)
      (C++17)
      Lexicographical comparison operations
      Permutation operations
      C library
      Numeric operations
      Operations on uninitialized memory
       
      Constrained algorithms
      All names in this menu belong to namespacestd::ranges
      Non-modifying sequence operations
      Modifying sequence operations
      Partitioning operations
      Sorting operations
      Binary search operations (on sorted ranges)
             
             
      Set operations (on sorted ranges)
      Heap operations
               
      pop_heap
      Minimum/maximum operations
      Permutation operations
      Fold operations
      Operations on uninitialized storage
      Return types
       
      Defined in header<algorithm>
      Call signature
      template<std::random_access_iterator I,std::sentinel_for<I> S,

               class Comp=ranges::less,class Proj=std::identity>
          requiresstd::sortable<I, Comp, Proj>

      constexpr I pop_heap( I first, S last, Comp comp={}, Proj proj={});
      (1)(since C++20)
      template<ranges::random_access_range R,

               class Comp=ranges::less,class Proj=std::identity>
          requiresstd::sortable<ranges::iterator_t<R>, Comp, Proj>
      constexprranges::borrowed_iterator_t<R>

          pop_heap( R&& r, Comp comp={}, Proj proj={});
      (2)(since C++20)

      Swaps the first element and the last element of the specifiedheap with respect tocomp andproj and makes the subrange excluding the first position into a heap with respect tocomp andproj. This has the effect of removing the first element from the specified heap.

      1) The specified heap is[firstlast).
      2) The specified heap isr.

      The function-like entities described on this page arealgorithm function objects (informally known asniebloids), that is:

      Contents

      [edit]Parameters

      first, last - the iterator-sentinel pair defining therange of elements to modify
      r - therange of elements to modify
      comp - comparator to apply to the projected elements
      proj - projection to apply to the elements

      [edit]Return value

      1)last
      2)ranges::end(r)

      [edit]Complexity

      At most\(\scriptsize 2\log{(N)}\)2log(N) applications ofcomp and\(\scriptsize 4\log{(N)}\)4log(N) applications ofproj, where\(\scriptsize N \)N is:

      1)ranges::distance(first, last)
      2)ranges::distance(r)

      [edit]Example

      Run this code
      #include <algorithm>#include <array>#include <iostream>#include <iterator>#include <string_view> template<class I=int*>void print(std::string_view rem, I first={}, I last={},std::string_view term="\n"){for(std::cout<< rem; first!= last;++first)std::cout<<*first<<' ';std::cout<< term;} int main(){std::array v{3,1,4,1,5,9,2,6,5,3};    print("initially, v: ", v.cbegin(), v.cend());     std::ranges::make_heap(v);    print("make_heap, v: ", v.cbegin(), v.cend());     print("convert heap into sorted array:");for(auto n{std::ssize(v)}; n>=0;--n){        std::ranges::pop_heap(v.begin(), v.begin()+ n);        print("[ ", v.cbegin(), v.cbegin()+ n,"]  ");        print("[ ", v.cbegin()+ n, v.cend(),"]\n");}}

      Output:

      initially, v: 3 1 4 1 5 9 2 6 5 3make_heap, v: 9 6 4 5 5 3 2 1 1 3convert heap into sorted array:[ 6 5 4 3 5 3 2 1 1 9 ]  [ ][ 5 5 4 3 1 3 2 1 6 ]  [ 9 ][ 5 3 4 1 1 3 2 5 ]  [ 6 9 ][ 4 3 3 1 1 2 5 ]  [ 5 6 9 ][ 3 2 3 1 1 4 ]  [ 5 5 6 9 ][ 3 2 1 1 3 ]  [ 4 5 5 6 9 ][ 2 1 1 3 ]  [ 3 4 5 5 6 9 ][ 1 1 2 ]  [ 3 3 4 5 5 6 9 ][ 1 1 ]  [ 2 3 3 4 5 5 6 9 ][ 1 ]  [ 1 2 3 3 4 5 5 6 9 ][ ]  [ 1 1 2 3 3 4 5 5 6 9 ]

      [edit]See also

      adds an element to a max heap
      (algorithm function object)[edit]
      checks if the given range is a max heap
      (algorithm function object)[edit]
      finds the largest subrange that is a max heap
      (algorithm function object)[edit]
      creates a max heap out of a range of elements
      (algorithm function object)[edit]
      turns a max heap into a range of elements sorted in ascending order
      (algorithm function object)[edit]
      removes the largest element from a max heap
      (function template)[edit]
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