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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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CPP14.md
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@@ -89,7 +89,7 @@ int& z = g(y); // reference to `y`
```
### decltype(auto)
The `decltype(auto)` type-specifier also deduces a type like `auto` does. However, it deduces return types while keeping their references or "const-ness", while `auto` will not.
The `decltype(auto)` type-specifier also deduces a type like `auto` does. However, it deduces return types while keeping their references and cv-qualifiers, while `auto` will not.
```c++
const int x = 0;
auto x1 = x; // int
@@ -121,6 +121,8 @@ static_assert(std::is_same<int, decltype(f(x))>::value == 1);
static_assert(std::is_same<const int&, decltype(g(x))>::value == 1);
```
See also: `decltype` (C++11).
### Relaxing constraints on constexpr functions
In C++11, `constexpr` function bodies could only contain a very limited set of syntaxes, including (but not limited to): `typedef`s, `using`s, and a single `return` statement. In C++14, the set of allowable syntaxes expands greatly to include the most common syntax such as `if` statements, multiple `return`s, loops, etc.
```c++