std::numeric_limits<T>::max

Since C++11

Header: <limits>

Returns the maximum finite value representable by the numeric type T. Meaningful for all bounded types.

# Declarations

static T max() throw();

(until C++11)

static constexpr T max() noexcept;

(since C++11)

# Example

#include <boost/type_index.hpp>
#include <cstddef>
#include <iomanip>
#include <iostream>
#include <limits>
#include <type_traits>
 
template<typename T>
void print_max_value_of()
{
    constexpr T max{std::numeric_limits<T>::max()};
 
    std::cout << std::setw(16) << boost::typeindex::type_id<T>() << ": ";
    if constexpr (std::is_floating_point_v<T>)
        std::cout << std::defaultfloat << max << " = " << std::hexfloat << max << '\n';
    else
    {
        constexpr auto m{static_cast<unsigned long long>(max)};
        std::cout << std::dec << m << " = " << std::hex << m << '\n';
    }
}
 
int main()
{
    std::cout << std::showbase;
 
    print_max_value_of<bool>();
    print_max_value_of<short>();
    print_max_value_of<int>();
    print_max_value_of<std::streamsize>();
    print_max_value_of<std::size_t>();
    print_max_value_of<char>();
    print_max_value_of<char16_t>();
    print_max_value_of<wchar_t>();
    print_max_value_of<float>();
    print_max_value_of<double>();
    print_max_value_of<long double>();
}

# See also