This is an unedited example from chapter 6 of Beginning C++ Through Game Programming:
// Inventory Displayer
// Demonstrates constant references
#include <iostream>
#include <string>
#include <vector>
using namespace std;
//parameter vec is a constant reference to a vector of strings
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;
}
//parameter vec is a constant reference to a vector of strings
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;
}
However, my edited version (no using directive) does not:
// Inventory Displayer
// Demonstrates constant references
#include <iostream>
#include <string>
#include <vector>
//parameter vec is a constant reference to a vector of strings
void display(const vector<std::string>& inventory);
int main()
{
vector<std::string> inventory;
inventory.push_back("sword");
inventory.push_back("armor");
inventory.push_back("shield");
display(inventory);
return 0;
}
//parameter vec is a constant reference to a vector of strings
void display(const vector<std::string>& vec)
{
std::cout << "Your items:\n";
for (vector<std::string>::const_iterator iter = vec.begin();
iter != vec.end(); ++iter)
std::cout << *iter << std::endl;
}
What obvious mistake am I not seeing?
