Erasing an element from a container while inside a range-based for loop

Question

I want to erase an element from a container which is being currently used within a ranged-based for loop. Will this cause undefined behaviour? Or will the next value of element after erase() be what the next element is supposed to be if I didn't call erase()?

Example:

std::map<int, int> someMap; /* Fill in someMap */ for (auto& element : someMap) { /* ... */ if ( /* Some condition */ ) someMap.erase(element.first); }

Shawnone · Accepted Answer · 2011-12-24 13:59:29Z

It should be a undefined behavior. Because according to 14882/2011 the range-based for statement is equivalent to:

auto && __range = range-init; for ( auto __begin = begin-expr(__range), __end = end-expr(__range); __begin != __end; ++__begin ) { for-range-declaration = *__begin; statement }

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