static T max() throw();
(until C++11)static constexpr T max() noexcept;
(since C++11)Returns the maximum finite value representable by the numeric type T. Meaningful for all bounded types.
Demonstrates the use of max() with some fundamental types and some standard library typedefs (the output is system-specific):
#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>();
}
Possible output:
bool: 1 = 0x1
short: 32767 = 0x7fff
int: 2147483647 = 0x7fffffff
long: 9223372036854775807 = 0x7fffffffffffffff
unsigned long: 18446744073709551615 = 0xffffffffffffffff
char: 127 = 0x7f
char16_t: 65535 = 0xffff
wchar_t: 2147483647 = 0x7fffffff
float: 3.40282e+38 = 0x1.fffffep+127
double: 1.79769e+308 = 0x1.fffffffffffffp+1023
long double: 1.18973e+4932 = 0xf.fffffffffffffffp+16380[edit] See also returns the lowest finite value of the given type, i.e. the most negative value for signed types, â0â for unsigned types
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