namespace std::placeholders { see below _1; see below _2; . . . see below _M; }
All placeholder types shall be DefaultConstructible and CopyConstructible, and their default constructors and copy/move constructors shall not throw exceptions. It is implementation-defined whether placeholder types are CopyAssignable. CopyAssignable placeholders' copy assignment operators shall not throw exceptions.
Placeholders should be defined as:
inline constexpr unspecified _1{};
If they are not, they shall be declared as:
extern unspecified _1;
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