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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_string_capacity.htm below:

C++ String Capacity

It returns the size of the storage space currently allocated for the string, expressed in terms of byte.

Following is the declaration for std::string::capacity.

size_t capacity() const;

size_t capacity() const noexcept;

none

It returns the size of the storage space currently allocated for the string, expressed in terms of bytes.

if an exception is thrown, there are no changes in the string.

In below example for std::string::capacity.

#include <iostream>
#include <string>

int main () {
   std::string str ("Sairamkrishna Mammahe");
   std::cout << "capacity: " << str.capacity() << "\n";
   return 0;
}

The sample output should be like this −

capacity: 21

string.htm

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