std::max
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Заголовочный файл <algorithm>
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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) |
Возвращает большее из двух значений.
3-4) Original:
Returns the greater of the two values.
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Возвращает наибольшее из значений в списке инициализации
ilist
.Original:
Returns the greatest of the values in initializer list
ilist
.The text has been machine-translated via Google Translate.
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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
.The text has been machine-translated via Google Translate.
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Содержание |
[править] 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:
The signature does not need to have const &, but the function must not modify the objects passed to it. | |||||||||
Type requirements | |||||||||||
-T must meet the requirements of LessThanComparable . for the overloads (1) and (3)
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-T must meet the requirements of CopyConstructible . for the overloads (3) and (4)
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[править] Возвращаемое значение
1-2)Чем больше из
3-4) a
и b
. Если они эквивалентны, возвращает a
.Original:
The greater of
a
and b
. If they are equivalent, returns a
.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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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.The text has been machine-translated via Google Translate.
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[править] Сложность
1-2)Constant
3-4) Original:
Constant
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Линейный в
ilist.size()
Original:
Linear in
ilist.size()
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[править] Возможная реализация
First version |
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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); } |
[править] 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
[править] См. также
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) | |
(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) |
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) |