27 lines
796 B
Markdown
27 lines
796 B
Markdown
counted
|
|
=======
|
|
|
|
```C++
|
|
for(auto x : counted(v)) {
|
|
... x.value ... x.index ...
|
|
}
|
|
```
|
|
`x.value` is a reference to the element in the container (so you can change it's value), `x.index` is what it is.
|
|
Container should have forward iterators.
|
|
|
|
|
|
This headers is purely a handy tool for the range-based-for-loops (ie `for(auto x : counter(v))`). Using it explicitly with iterators is not recommended!
|
|
|
|
|
|
There is no const version of it. Doing `for(const auto x : counted(v))` doesn't make it impossible to change `x` (so the element in the container can be modified).
|
|
|
|
|
|
Example:
|
|
```C++
|
|
for(auto x : counted(v)) {
|
|
std::cout << "v[" << x.index << "] = " << x.value << std::endl;
|
|
x.value *= 2;
|
|
}
|
|
```
|
|
This will output the container `v`, with it's indeces. And it will multiply every value in `v` by 2.
|
|
|