constant references : reference « Data Types « C++ Tutorial

#include <iostream>
#include <string>
#include <vector>

using namespace std;

void display(const vector<string>& inventory);

int main()
{
    vector<string> inventory;
    inventory.push_back("sword");
    inventory.push_back("armor");
    inventory.push_back("shield");

    display(inventory);

    return 0;
}

void display(const vector<string>& vec)
{
    cout << "Your items:\n";
    for (vector<string>::const_iterator iter = vec.begin();
         iter != vec.end(); ++iter)
         cout << *iter << endl;
}

2.32.reference
	2.32.1.	Creating and Using References
	2.32.2.	Use References operator &
	2.32.3.	References must be initialized
	2.32.4.	Change reference value
	2.32.5.	Reassigning a reference
	2.32.6.	Returning a reference
	2.32.7.	Assign value to a reference-return
	2.32.8.	Return a reference to an array element.
	2.32.9.	Use an independent reference.
	2.32.10.	class for counted reference semantics
	2.32.11.	Use reference to swap value
	2.32.12.	constant references
	2.32.13.	Use reference as a return type