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Showing content from https://timsong-cpp.github.io/cppwp/n4659/func.bind.place below:

[func.bind.place]

23 General utilities library [utilities] 23.14 Function objects [function.objects] 23.14.11 Function object binders [func.bind] 23.14.11.4 Placeholders [func.bind.place]
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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