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Is there an available combination of std::ios::openmode to avoid modifications of an existing file and allow only the creation of a new one ?
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No there isn't. See the C++03 Standard § 27.4.2.1.4/1, or the C++11 Standard § 27.5.3.1.4/1 if to hand or otherwise http://en.cppreference.com/w/cpp/io/ios_base/openmode. As none of the specified constants that may be |-conjoined to form an
openmodeimplies that the opened file shall not exist no conjunction of them can have that implication.