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Add sections for decltypes and improve descriptions.

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Anthony Calandra
2018-08-23 22:17:56 -04:00
parent 12b9992c01
commit 2f7066a939
3 changed files with 12 additions and 4 deletions
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CPP11.md
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@@ -178,7 +178,7 @@ auto f3 = [x] () mutable { x = 2; }; // OK: the lambda can perform any operation
```
### decltype
`decltype` is an operator which returns the _declared type_ of an expression passed to it. Examples of `decltype`:
`decltype` is an operator which returns the _declared type_ of an expression passed to it. cv-qualifiers and references are maintained if they are part of the expression. Examples of `decltype`:
```c++
int a = 1; // `a` is declared as type `int`
decltype(a) b = a; // `decltype(a)` is `int`
@@ -197,6 +197,8 @@ auto add(X x, Y y) -> decltype(x + y) {
add(1, 2.0); // `decltype(x + y)` => `decltype(3.0)` => `double`
```
See also: `decltype(auto)` (C++14).
### Template aliases
Semantically similar to using a `typedef` however, template aliases with `using` are easier to read and are compatible with templates.
```c++