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How do I access the next element in range based for loop before the next loop?
I know with an iterative approach you do something like arr[++i], but how do I achieve the same result in a range-based for loop?
for (auto& cmd : arr) {
steps = nextElement; //How do I get this nextElement before the next loop?
}
I understand I probably shouldn't be using a range-based for loop, but that's the requirement provided for this project.
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Range-based for loop in C++It executes a for loop over a range. Used as a more readable equivalent to the traditional for loop operating over a range of values, such as all elements in a container.
Range-for is as fast as possible since it caches the end iterator[citationprovided], uses pre-increment and only dereferences the iterator once.
Use enumerate() to access previous and next values in a list. Loop over enumerate(list) in a for loop with the syntax for index, elem in enumerate(list) . To access the next element in list , use list[index+1] and to access the previous element use list[index-1] .
Range-based for loop in C++ Often the auto keyword is used to automatically identify the type of elements in range-expression.
If the range has contiguous storage (e.g. std::vector, std::array, std::basic_string or a native array), then you can do this:
for (auto& cmd : arr) {
steps = *(&cmd + 1);
}
Otherwise, you can't, without an external variable.
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