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Showing content from https://cplusplus.com/string::length below:

public member function

<string>

size_t length() const noexcept;

Return length of string

This is the number of actual bytes that conform the contents of the string, which is not necessarily equal to its storage capacity.

Note that string objects handle bytes without knowledge of the encoding that may eventually be used to encode the characters it contains. Therefore, the value returned may not correspond to the actual number of encoded characters in sequences of multi-byte or variable-length characters (such as UTF-8).

Both string::size and string::length are synonyms and return the exact same value.

size_t is an unsigned integral type (the same as member type string::size_type).

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// string::length
#include <iostream>
#include <string>

int main ()
{
  std::string str ("Test string");
  std::cout << "The size of str is " << str.length() << " bytes.\n";
  return 0;
}

The size of str is 11 bytes

string::size

Return length of string (public member function)

string::resize

Resize string (public member function)

string::max_size

Return maximum size of string (public member function)

string::capacity

Return size of allocated storage (public member function)

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