std::max

Header: <algorithm>

Returns the greater of the given values.

# Declarations

template< class T >
const T& max( const T& a, const T& b );

(constexpr since C++14)

template< class T, class Compare >
const T& max( const T& a, const T& b, Compare comp );

(constexpr since C++14)

template< class T >
T max( std::initializer_list<T> ilist );

(since C++11) (constexpr since C++14)

template< class T, class Compare >
T max( std::initializer_list<T> ilist, Compare comp );

(since C++11) (constexpr since C++14)

# Parameters

• a, b: the values to compare
• ilist: initializer list with the values to compare
• comp: comparison function object (i.e. an object that satisfies the requirements of Compare) which returns true 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); While the signature does not need to have const&, the function 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 T can be implicitly converted to both of them.

# Notes

Capturing the result of std::max by reference produces a dangling reference if one of the parameters is a temporary and that parameter is returned:

# Example

#include <algorithm>
#include <iomanip>
#include <iostream>
#include <string_view>
 
int main()
{
    auto longest = [](const std::string_view s1, const std::string_view s2)
                   {
                       return s1.size() < s2.size();
                   };
 
    std::cout << "Larger of 69 and 96 is " << std::max(69, 96) << "\n"
                 "Larger of 'q' and 'p' is '" << std::max('q', 'p') << "'\n"
                 "Largest of 010, 10, 0X10, and 0B10 is "
              << std::max({010, 10, 0X10, 0B10}) << '\n'
              << R"(Longest of "long", "short", and "int" is )"
              << std::quoted(std::max({"long", "short", "int"}, longest)) << '\n';
}

# Defect reports

# See also

• min
• minmax
• max_element
• clamp
• ranges::max