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

If T has a nested type cancellation_slot_type, returns t.get_cancellation_slot(). Otherwise returns type().

static static decltype(
    auto ) const;
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If T has a nested type cancellation_slot_type, returns t.get_cancellation_slot(). Otherwise returns s.

static static decltype(
    auto ) const;
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