Movatterモバイル変換


[0]ホーム

URL:


cppreference.com
Namespaces
Variants
    Actions

      std::ranges::sort_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
               
      sort_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 sort_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>

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

      Sorts the elements in the specified range with respect tocomp andproj, where the range originally represents aheap with respect tocomp andproj. The sorted range no longer maintains the heap property.

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

      If the specified range is not a heap with respect tocomp andproj, the behavior is undefined.

      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\(\scriptsize 2N \cdot \log(N)\)2N⋅log(N) applications ofcomp and\(\scriptsize 4N \cdot \log(N)\)4N⋅log(N) applications ofproj, where\(\scriptsize N \)N is:

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

      [edit]Possible implementation

      struct sort_heap_fn{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 operator()(I first, S last, Comp comp={}, Proj proj={})const{auto ret{ranges::next(first, last)};for(auto last{ret}; first!= last;--last)ranges::pop_heap(first, last, comp, proj);return ret;} 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>        operator()(R&& r, Comp comp={}, Proj proj={})const{return(*this)(ranges::begin(r),ranges::end(r), std::move(comp), std::move(proj));}}; inlineconstexpr sort_heap_fn sort_heap{};

      [edit]Example

      Run this code
      #include <algorithm>#include <array>#include <iostream> void print(autoconst& rem,constauto& v){std::cout<< rem;for(constauto i: v)std::cout<< i<<' ';std::cout<<'\n';} int main(){std::array v{3,1,4,1,5,9};    print("original array:  ", v);     std::ranges::make_heap(v);    print("after make_heap: ", v);     std::ranges::sort_heap(v);    print("after sort_heap: ", v);}

      Output:

      original array:  3 1 4 1 5 9after make_heap: 9 5 4 1 1 3after sort_heap: 1 1 3 4 5 9

      [edit]See also

      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]
      removes the largest element from a max heap
      (algorithm function object)[edit]
      adds an element to a max heap
      (algorithm function object)[edit]
      turns a max heap into a range of elements sorted in ascending order
      (function template)[edit]
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/algorithm/ranges/sort_heap&oldid=182187"

      [8]ページ先頭

      ©2009-2025 Movatter.jp