Automatic Type Deduction: decltype
Let's take a look at what decltype does.
We'll cover the following
decltype
vs auto
The decltype
keyword was also introduced in C++11, though its functionality differs from auto
. decltype
is used to determine the type of an expression or entity.
Here is the correct format:
decltype(expression)
We can use auto to create variables, but decltype
returns the type of an expression containing variables.
Rules
-
If the expression is an lvalue,
decltype
will return a reference to the data type of the expression -
If the expression is an rvalue,
decltype
will return the data type of the value
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