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Showing content from https://cplusplus.com/basic_string::max_size below:

public member function

<string>

size_type max_size() const;

size_type max_size() const noexcept;

Return maximum size

This is the maximum potential length the string can reach due to known system or library implementation limitations, but the object is not guaranteed to be able to reach that length: it can still fail to allocate storage at any point before that length is reached.

Member type size_type is an unsigned integral type.

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// comparing size, length, capacity and max_size
#include <iostream>
#include <string>

int main ()
{
  std::string str ("Test string");
  std::cout << "size: " << str.size() << "\n";
  std::cout << "length: " << str.length() << "\n";
  std::cout << "capacity: " << str.capacity() << "\n";
  std::cout << "max_size: " << str.max_size() << "\n";
  return 0;
}

size: 11
length: 11
capacity: 15
max_size: 4294967291

Unspecified, but generally constant.

Constant.

basic_string::capacity

Return size of allocated storage (public member function)

basic_string::size

Return size (public member function)

basic_string::resize

Resize string (public member function)

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