library/cpp/iterator/iterate_keys.h


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#pragma once 
 
#include "mapped.h" 
 
template<typename TMapping> 
auto IterateKeys(TMapping&& map) { 
    return ::MakeMappedRange( 
        std::forward<TMapping>(map), 
        [](const auto& x) -> decltype((x.first)) { 
            return x.first; 
        } 
    ); 
}