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

[func.bind.isbind]

23 General utilities library [utilities] 23.14 Function objects [function.objects] 23.14.11 Function object binders [func.bind] 23.14.11.1 Class template is_­bind_­expression [func.bind.isbind]
namespace std {
  template<class T> struct is_bind_expression;  }

The class template is_­bind_­expression can be used to detect function objects generated by bind. The function template bind uses is_­bind_­expression to detect subexpressions.

Instantiations of the is_­bind_­expression template shall meet the UnaryTypeTrait requirements. The implementation shall provide a definition that has a base characteristic of true_­type if T is a type returned from bind, otherwise it shall have a base characteristic of false_­type. A program may specialize this template for a user-defined type T to have a base characteristic of true_­type to indicate that T should be treated as a subexpression in a bind call.


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