~nonesuch() = delete;
nonesuch(nonesuch const&) = delete;
void operator=(nonesuch const&) = delete;
std::experimental::nonesuch
is a class type used by std::experimental::detected_t to indicate detection failure.
nonesuch
has no default constructor or initializer-list constructor, and is not an aggregate.
nonesuch
cannot be constructed, destroyed, or copied.
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR Applied to Behavior as published Correct behavior LWG 2960 LFTSv2nonesuch
may be an aggregate and has an implicit conversion sequence from {}
made non-aggregate and removed ICS
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