The C++20 for-each range differences, part III

With the C++20, there is a new capability that helps when the index is still needed within the loop:

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int main() { const char buffer[]{"buffer"}; for(int i = 0; const auto & c : buffer) { ++i; } }

The generated source code is then:

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int main() { const char buffer[7] = {"buffer"}; { int i = 0; char const (&__range1)[7] = buffer; const char * __begin1 = static_cast<const char *>(__range1); const char * __end1 = static_cast<const char *>(__range1) + 7L; for(; __begin1 != __end1; ++__begin1) { const char & c = *__begin1; ++i; } } }

[keywords: for loop, for-each range, c++98, c++11, c++14, c++17, c++20]