Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Retrieves a reference to the underlying std::uint64_t value or throws an exception.

const std::uint64_t&
as_uint64() const;
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Retrieves a reference to the underlying std::uint64_t value or throws an exception.

std::uint64_t&
as_uint64();
  » more...