# std::basic_string_view<CharT,Traits>::max_size

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< cpp‎ | string‎ | basic string view

constexpr size_type max_size() const noexcept; |  | (since C++17)

The largest possible number of char-like objects that can be referred to by a `basic_string_view`.

### Parameters

(none)

### Return value

Maximum number of characters.

### Complexity

Constant.

### Example

Run this code

    #include <iostream>
    #include <limits>
    #include <string_view>

    int main() {
        std::cout
            << std::numeric_limits<std::int64_t>::max()
            << " <- numeric_limits<int64_t>::max()\n"
            << std::string_view{}.max_size()
            << " <- std::string_view::max_size()\n"
            << std::basic_string_view<char>{}.max_size()
            << " <- std::basic_string_view<char>::max_size()\n"
            << std::basic_string_view<char16_t>{}.max_size()
            << " <- std::basic_string_view<char16_t>::max_size()\n"
            << std::wstring_view{}.max_size()
            << " <- std::wstring_view::max_size()\n"
            << std::basic_string_view<char32_t>{}.max_size()
            << " <- std::basic_string_view<char32_t>::max_size()\n"
            ;
    }

Possible output:

    9223372036854775807 <- numeric_limits<int64_t>::max()
    4611686018427387899 <- std::string_view::max_size()
    4611686018427387899 <- std::basic_string_view<char>::max_size()
    2305843009213693949 <- std::basic_string_view<char16_t>::max_size()
    1152921504606846974 <- std::wstring_view::max_size()
    1152921504606846974 <- std::basic_string_view<char32_t>::max_size()

### See also

size length (C++17) | returns the number of characters (public member function)
empty (C++17) | checks whether the view is empty (public member function)
max_size | returns the maximum number of characters (public member function of `std::basic_string<CharT,Traits,Allocator>`)

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