No member named 'size' in namespace 'std'

Question

I'm trying to port some C++ code from Windows to OS X (using Xcode).

The following code:

writePosition %= std::size(bufferL);

is generating an error:

No member named 'size' in namespace 'std'

How do I fix this?

Answer 1

std::size() is available starting from C++17. Try enabling -std=c++17 for your compiler.

Also, double check that the source files contain #include <iterator>, either directly, or indirectly by #include'ing any of the following headers:

• <array>
• <deque>
• <forward_list>
• <list>
• <map>
• <regex>
• <set>
• <string>
• <string_view>
• <unordered_map>
• <unordered_set>
• <vector>