#include <iostream>
#include <string>
#include <memory>
 
int main() {
	std::string cadena = "Hola";
	const char *cadena_c = (const char *)(addressof(cadena));
	unsigned int i = 0;
 
	std::cout << std::hex;
	for(i = 0; i < sizeof(cadena); i++)
		std::cout << (unsigned int)cadena_c[i] << " - " << cadena_c[i] << std::endl;
 
	return 0;
}

10 - ►
fffffffe - ■
23 - #
0 -
0 -
0 -
0 -
0 -
4 - ♦
0 -
0 -
0 -
0 -
0 -
0 -
0 -
48 - H
6f - o
6c - l
61 - a
0 -
ffffffff -  
ffffffff -  
ffffffff -  
fffffff5 - §
18 - ↑
40 - @
0 -
0 -
0 -
0 -
0 -

A bad_alloc exception is thrown if the function fails when attempting to allocate storage.

#include <iostream>
#include <string>
#include <memory>
 
int main() {
	unsigned int variable = 0;
	std::string cadena = "Hola";
	char *caracter = new char;
 
	std::cout << "Direccion de variable local: " << &variable << std::endl;
	std::cout << "Direccion de cadena: " << (void *)cadena.c_str() << std::endl;
	std::cout << "Direccion de un byte en el heap: " << (void *)caracter << std::endl;
 
	delete caracter;
	return 0;
}

Direccion de variable local: 0x23fe30
Direccion de cadena: 0x23fe20
Direccion de un byte en el heap: 0x4b18f0

#include <iostream>
#include <string>
 
using namespace std;
 
int main() {
	string str1(15, ' ');
	string str2(16, ' ');
	cout << (void*)&str1 << endl;
	cout << (void*)str1.data() << endl;
	cout << (void*)str1.get_allocator().allocate(1, &str1) << endl << endl;
	cout << (void*)&str2 << endl;
	cout << (void*)str2.data() << endl;
	cout << (void*)str2.get_allocator().allocate(1, &str1) << endl;
}