Use the auto keyword in C++ STL

Question

I have seen code which use vector,

vectors;
s.push_back(11);
s.push_back(22);
s.push_back(33);
s.push_back(55);
for (vector::iterator i         


        

Answer 1

The auto keyword gets the type from the expression on the right of =. Therefore it will work with any type, the only requirement is to initialize the auto variable when declaring it so that the compiler can deduce the type.

Examples:

auto a = 0.0f;  // a is float
auto b = std::vector();  // b is std::vector()

MyType foo()  { return MyType(); }

auto c = foo();  // c is MyType