std::max

 

C++

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Понятия

Утилиты библиотеки

Струны библиотеки

Контейнеры библиотеки

Алгоритмы библиотеки

Итераторы библиотеки

Numerics библиотеки

Библиотеки ввода / вывода

Локализация библиотеки

Библиотеки регулярных выражений (C++11)

Атомная библиотеке операций (C++11)

Библиотека тему поддержки (C++11)

 

Алгоритмы

Функции
Немодифицирующие линейные операции
all_of any_of none_of (C++11) (C++11) (C++11) for_each count count_if mismatch equal	find find_if find_if_not (C++11) find_end find_first_of adjacent_find search search_n
Модифицирующие линейные операции
copy copy_if (C++11) copy_n (C++11) copy_backward move (C++11) move_backward (C++11) fill fill_n transform generate generate_n remove remove_if remove_copy remove_copy_if	replace replace_if replace_copy replace_copy_if swap swap_ranges iter_swap reverse reverse_copy rotate rotate_copy random_shuffle shuffle   (C++11) unique unique_copy
Разделение
is_partitioned (C++11) partition partition_copy (C++11)	stable_partition partition_point (C++11)
Сортировка (на отсортированных промежутках)
is_sorted (C++11) is_sorted_until (C++11) sort	partial_sort partial_sort_copy stable_sort nth_element
Бинарный поиск (на отсортированных промежутках)
lower_bound upper_bound	binary_search equal_range
Множества (на отсортированных промежутках)
merge inplace_merge includes	set_difference set_intersection set_symmetric_difference set_union
Куча
is_heap is_heap_until (C++11) make_heap	push_heap pop_heap sort_heap
Минимум/максимум
max max_element min min_element minmax (C++11) minmax_element (C++11)	lexicographical_compare is_permutation (C++11) next_permutation prev_permutation
Числовые операции
iota (C++11) accumulate inner_product	adjacent_difference partial_sum
Библиотека C
qsort	bsearch

 

Заголовочный файл <algorithm>
template< class T > const T& max( const T& a, const T& b );	(1)
template< class T, class Compare > const T& max( const T& a, const T& b, Compare comp );	(2)
template< class T > T max( std::initializer_list<T> ilist);	(3)	(начиная с C++11)
template< class T, class Compare > T max( std::initializer_list<T> ilist, Compare comp );	(4)	(начиная с C++11)

1-2)

Возвращает большее из двух значений.

Original:

Returns the greater of the two values.

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3-4)

Возвращает наибольшее из значений в списке инициализации ilist.

Original:

Returns the greatest of the values in initializer list ilist.

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(1,3) версии используют operator< для сравнения значений, (2,4) версии использовать данную функцию сравнения comp.

Original:

The (1,3) versions use operator< to compare the values, the (2,4) versions use the given comparison function comp.

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Параметры

a, b	-	значений для сравнения Original: the values to compare The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ilist	-	инициализатор список значений для сравнения Original: initializer list with the values to compare The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
comp	-	comparison function which returns ​true if if a is less than b. The signature of the comparison function should be equivalent to the following: bool cmp(const Type1 &a, const Type2 &b); The signature does not need to have const &, but the function must not modify the objects passed to it. The types  Type1 and  Type2 must be such that an object of type T can be implicitly converted to both of them. ​
Type requirements
- T must meet the requirements of LessThanComparable. for the overloads (1) and (3)
- T must meet the requirements of CopyConstructible. for the overloads (3) and (4)

Возвращаемое значение

1-2)

Чем больше из a и b. Если они эквивалентны, возвращает a.

Original:

The greater of a and b. If they are equivalent, returns a.

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3-4)

Наибольшее значение в ilist. Если несколько значений эквивалентных до большого, возвращает левые один.

Original:

The greatest value in ilist. If several values are equivalent to the greatest, returns the leftmost one.

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Сложность

1-2)

Constant

Original:

Constant

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3-4)

Линейный в ilist.size()

Original:

Linear in ilist.size()

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Возможная реализация

First version
template<class T> const T& max(const T& a, const T& b) { return (a < b) ? b : a; }
Second version
template<class T, class Compare> const T& max(const T& a, const T& b, Compare comp) { return (comp(a, b)) ? b : a; }
Third version
template< class T > T max( std::initializer_list<T> ilist) { return *std::max_element(ilist.begin(), ilist.end()); }
Fourth version
template< class T, class Compare > T max( std::initializer_list<T> ilist, Compare comp ) { return *std::max_element(ilist.begin(), ilist.end(), comp); }

Пример

#include <algorithm>
#include <iostream>
#include <string>
int main()
{
    std::cout << "larger of 1 and 9999: " << std::max(1, 9999) << '\n'
              << "larger of 'a', and 'b': " << std::max('a', 'b') << '\n'
              << "longest of \"foo\", \"bar\", and \"hello\": " <<
                  std::max( { "foo", "bar", "hello" },
                            [](const std::string& s1, const std::string& s2) {
                                 return s1.size() < s2.size();
                             }) << '\n';
}

Вывод:

larger of 1 and 9999: 9999
larger of 'a', and 'b': b
longest of "foo", "bar", and "hello": hello

См. также

min	Возвращает меньшее из двух элементов Original: returns the smaller of two elements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (шаблон функции)
minmax (C++11)	Возвращает большее и меньшее из двух элементов Original: returns the larger and the smaller of two elements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (шаблон функции)
max_element	возвращает наибольший элемент в диапазоне Original: returns the largest element in a range The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (шаблон функции)