Method DoInit

util/system/filemap.h:279–288

private:
    void DoInit(const TString& fileName) {
        DataHolder_->Map(0, DataHolder_->Length());
        if (DataHolder_->Length() % sizeof(T)) {
            Term();
            ythrow yexception() << "Incorrect size of file " << fileName.Quote();
        }
        Ptr_ = (const T*)DataHolder_->Ptr();
        Size_ = DataHolder_->Length() / sizeof(T);
        End_ = Ptr_ + Size_;
    }
};

class TMappedAllocation: TMoveOnly {