Typedef

[rddscalif]

Could someone just give me a few examples of using typedef? My teacher uses it a lot, and I want to be able to start using it. Thanks much!

Ryan

[LB]

All it does it create a alias of a type. The syntax is from C and is a bit awkward, so C++11 has a new form that also supports more functionality.

typedef std::string str; //str is now an alias of std::string
using s = std::string; //s is now an alias of std::string 

The latter form is preferred because it is easier to read and write - it makes more sense than the C syntax.

The latter form can also be templated, unlike the first form:

template<typename T>
using vec = std::vector<T>;

//...

vec<int> a;
vec<std::string> b;
using dvec = vec<double>;

Personally, I like to use aliases to indicate how a type should be treated. It's simpler than creating a full-blown class in most cases and can be easily swapped-out.

[keskiverto]

http://en.cppreference.com/w/cpp/language/typedef

However, C++11 has type alias, which is even more fun.

[TarikNeaj]

https://www.youtube.com/watch?v=cVtgQV-MWZM&ab_channel=CodingMadeEasy

First minute and 43 seconds.

[rddscalif]

so say I am using an array.

It would go something like:

typedef std::array<float, 100> storage_type;

?

[LB]

using storage_t = std::array<float, 100>;

Save your fingers. Everyone knows what blah_t is short for.