std::max

From Cppreference

1-2) Returns the greater of the two values.

3-4) Returns the greatest of the values in initializer list ilist.

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

[edit] Parameters

[edit] Return value

1-2) The greater of a and b. If they are equivalent, returns a.

3-4) The greatest value in ilist. If several values are equivalent to the greatest, returns the leftmost one.

[edit] Complexity

1-2) Constant

3-4) Linear in ilist.size()

[edit] Equivalent function

template<class T> 
const T& max(const T& a, const T& b)
{
    return (a < b) ? b : a;
}

template<class T, class Compare> 
const T& max(const T& a, const T& b, Compare comp)
{
    return (comp(a, b)) ? b : a;
}

template< class T >
T max( std::initializer_list ilist)
{
    return *std::max_element(ilist.begin(), ilist.end());
}

template< class T, class Compare >
T max( std::initializer_list ilist, Compare comp )
{
    return *std::max_element(ilist.begin(), ilist.end(), comp);
}

[edit] Example

#include <algorithm>
#include <iostream>
 
int main()
{
    std::cout << "larger of 1 and 9999: " << std::max(1, 9999) << '\n';
    std::cout << "larger of 'a' and 'b': " << std::max('a', 'b') << '\n';
    std::cout << "larger of 3.5 and 2.5: " << std::max(3.5, 2.5) << '\n';
}

Output:

larger of 1 and 9999: 9999
larger of 'a' and 'b': b
larger of 3.5 and 2.5: 3.5

[edit] See also