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28 lines
796 B
28 lines
796 B
13 years ago
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counted
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=======
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```C++
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for(auto x : counted(v)) {
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... x.value ... x.index ...
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}
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```
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`x.value` is a reference to the element in the container (so you can change it's value), `x.index` is what it is.
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Container should have forward iterators.
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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!
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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).
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Example:
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```C++
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for(auto x : counted(v)) {
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std::cout << "v[" << x.index << "] = " << x.value << std::endl;
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x.value *= 2;
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}
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```
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This will output the container `v`, with it's indeces. And it will multiply every value in `v` by 2.
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