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Added ref-qualified member functions.

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Anthony Calandra
2019-06-13 22:28:43 -04:00
parent 4f508fc626
commit 1a5af17e8a
2 changed files with 56 additions and 2 deletions
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29
CPP11.md
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@@ -31,6 +31,7 @@ C++11 includes the following new language features:
- [inline-namespaces](#inline-namespaces) - [inline-namespaces](#inline-namespaces)
- [non-static data member initializers](#non-static-data-member-initializers) - [non-static data member initializers](#non-static-data-member-initializers)
- [right angle brackets](#right-angle-brackets) - [right angle brackets](#right-angle-brackets)
- [ref-qualified member functions](#ref-qualified-member-functions)
C++11 includes the following new library features: C++11 includes the following new library features:
- [std::move](#stdmove) - [std::move](#stdmove)
@@ -575,7 +576,7 @@ class Human {
}; };
``` ```
### Right angle Brackets ### Right angle brackets
C++11 is now able to infer when a series of right angle brackets is used as an operator or as a closing statement of typedef, without having to add whitespace. C++11 is now able to infer when a series of right angle brackets is used as an operator or as a closing statement of typedef, without having to add whitespace.
```c++ ```c++
@@ -583,6 +584,32 @@ typedef std::map<int, std::map <int, std::map <int, int> > > cpp98LongTypedef;
typedef std::map<int, std::map <int, std::map <int, int>>> cpp11LongTypedef; typedef std::map<int, std::map <int, std::map <int, int>>> cpp11LongTypedef;
``` ```
### Ref-qualified member functions
Member functions can now be qualified depending on whether `*this` is an lvalue or rvalue reference.
```c++
struct Bar {
// ...
};
struct Foo {
Bar getBar() & { return bar; }
Bar getBar() const& { return bar; }
Bar getBar() && { return std::move(bar); }
private:
Bar bar{};
};
Foo foo{};
Bar bar = foo.getBar(); // calls `Bar getBar() &`
const Foo foo2{};
Bar bar2 = foo2.getBar(); // calls `Bar Foo::getBar() const&`
Foo{}.getBar(); // calls `Bar Foo::getBar() &&`
std::move(foo).getBar(); // calls `Bar Foo::getBar() &&`
```
## C++11 Library Features ## C++11 Library Features
### std::move ### std::move

29
README.md
View File

@@ -74,6 +74,7 @@ C++11 includes the following new language features:
- [inline-namespaces](#inline-namespaces) - [inline-namespaces](#inline-namespaces)
- [non-static data member initializers](#non-static-data-member-initializers) - [non-static data member initializers](#non-static-data-member-initializers)
- [right angle brackets](#right-angle-brackets) - [right angle brackets](#right-angle-brackets)
- [ref-qualified member functions](#ref-qualified-member-functions)
C++11 includes the following new library features: C++11 includes the following new library features:
- [std::move](#stdmove) - [std::move](#stdmove)
@@ -1167,7 +1168,7 @@ class Human {
}; };
``` ```
### Right angle Brackets ### Right angle brackets
C++11 is now able to infer when a series of right angle brackets is used as an operator or as a closing statement of typedef, without having to add whitespace. C++11 is now able to infer when a series of right angle brackets is used as an operator or as a closing statement of typedef, without having to add whitespace.
```c++ ```c++
@@ -1175,6 +1176,32 @@ typedef std::map<int, std::map <int, std::map <int, int> > > cpp98LongTypedef;
typedef std::map<int, std::map <int, std::map <int, int>>> cpp11LongTypedef; typedef std::map<int, std::map <int, std::map <int, int>>> cpp11LongTypedef;
``` ```
### Ref-qualified member functions
Member functions can now be qualified depending on whether `*this` is an lvalue or rvalue reference.
```c++
struct Bar {
// ...
};
struct Foo {
Bar getBar() & { return bar; }
Bar getBar() const& { return bar; }
Bar getBar() && { return std::move(bar); }
private:
Bar bar{};
};
Foo foo{};
Bar bar = foo.getBar(); // calls `Bar getBar() &`
const Foo foo2{};
Bar bar2 = foo2.getBar(); // calls `Bar Foo::getBar() const&`
Foo{}.getBar(); // calls `Bar Foo::getBar() &&`
std::move(foo).getBar(); // calls `Bar Foo::getBar() &&`
```
## C++11 Library Features ## C++11 Library Features
### std::move ### std::move