C++ Use the methods of vector with a struct - c++

Question

i would like to do a thing like this. can ou help me :) Thank you
/* Example: */
struct Name
{
const char *full_name;
const char *name;
};
std::vector<Name> n = { {"Harry Potter", "Harry"}, {"Hermione Granger", "Hermione"} };
// The expressions below does not work
string::const_iterator b = n.begin();
string::const_iterator e = n.end();
int s = n.size();
// ...

Answer 1

The problem mainly comes from the :
string::const_iterator b = n.begin(); // not possible
string::const_iterator e = n.end(); // not possible
int s = n.size(); // working as intended if you print it to the console
If you want to declare an iterator, in this case, you could do :
std::vector<Name>::const_iterator it;
If you would like to have control with the iterator, use it in a for loop :
for (it = n.begin(); it != n.end() - 1; it++) // Will stop at the first name in our example
{
std::cout << it->full_name << std::endl;
}
As it is pointing to n, in order to access its values, don't forget to use ->.
If you wanted to iterate through the whole vector, it is possible to use a simple loop.`
for (auto i: n)
{
std::cout << "My name is " << i.name << ", ";
std::cout << i.full_name << std::endl;
}`
On a side note, you did not need to declare "it" before it was used in the for loop.
The following would work too :
for (auto it = n.begin(); it != n.end() - 1; it++) // Will stop at the first name in our example
{
std::cout << it->full_name << std::endl;
}
For reference, here is my final code with examples, I hope that solves your problem :
struct Name
{
std::string full_name;
std::string name;
};
int main()
{
std::vector<Name> n = { {"Harry Potter", "Harry"}, {"Hermione Granger", "Hermione"} };
std::vector<Name>::const_iterator it;
for (auto i : n) // Printing the whole vector
{
std::cout << "My name is " << i.name << ", ";
std::cout << i.full_name << std::endl;
}
for (it = n.begin(); it != n.end() - 1; it++) // will return all the names except the last
{
std::cout << it->full_name << std::endl;
}
for (auto g = n.begin(); g != n.end() - 1; g++) // same as it, iterator initialized in the loop
{
std::cout << g->full_name << std::endl;
}
return 0;
}