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std::forward_list::sort(3) C++ Standard Libary std::forward_list::sort(3) NAME std::forward_list::sort - std::forward_list::sort Synopsis void sort(); (1) (since C++11) template< class Compare > (2) (since C++11) void sort( Compare comp ); Sorts the elements in ascending order. The order of equal elements is preserved. The first version uses operator< to compare the elements, the second version uses the given comparison function comp. If an exception is thrown, the order of elements in *this is unspec- ified. Parameters comparison function object (i.e. an object that satisfies the requirements of Compare) which returns true if the first argument is less than (i.e. is ordered before) the second. The signature of the comparison function should be equivalent to the following: bool cmp(const Type1 &a, const Type2 &b); comp - While the signature does not need to have const &, the func- tion must not modify the objects passed to it and must be able to accept all values of type (possibly const) Type1 and Type2 regardless of value category (thus, Type1 & is not allowed , nor is Type1 unless for Type1 a move is equivalent to a copy (since C++11)). The types Type1 and Type2 must be such that an object of type forward_list<T,Allocator>::const_iterator can be dereferenced and then implicitly converted to both of them. Return value (none) Complexity Approximately N log N comparisons, where N is the number of elements in the list. Notes std::sort requires random access iterators and so cannot be used with forward_list . This function also differs from std::sort in that it does not re- quire the element type of the forward_list to be swappable, preserves the values of all iterators, and performs a stable sort. Example // Run this code #include <iostream> #include <functional> #include <forward_list> std::ostream& operator<<(std::ostream& ostr, const std::for- ward_list<int>& list) { for (auto &i : list) { ostr << " " << i; } return ostr; } int main() { std::forward_list<int> list = { 8,7,5,9,0,1,3,2,6,4 }; std::cout << "before: " << list << "\n"; list.sort(); std::cout << "ascending: " << list << "\n"; list.sort(std::greater<int>()); std::cout << "descending: " << list << "\n"; } Output: before: 8 7 5 9 0 1 3 2 6 4 ascending: 0 1 2 3 4 5 6 7 8 9 descending: 9 8 7 6 5 4 3 2 1 0 http://cppreference.com 2022.07.31 std::forward_list::sort(3)
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