Define variable b of the same type as variable a

Question

Is it possible to declare a variable var_b of the same type as another variable, var_a?

For example:

template <class T> void foo(T t) {     auto var_a = bar(t);    //make var_b of the same type as var_a  }   F_1 bar(T_1 t) {  }  F_2 bar(T_2 t) {  } 

Answer 1

Sure, use decltype:

auto var_a = bar(t); decltype(var_a) b; 

You can add cv-qualifiers and references to decltype specifiers as if it were any other type:

const decltype(var_a)* b; 

Answer 2

decltype(var_a) var_b; 

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