Available requires<> for overloading.

Detailed Description

See require_meta_doc for an overview of their use and for how to build your own custom requires for functions.

The modules below group the different possible require constraints available for overloading functions.

Modules
	Scalar types
	require type traits for types that are either arithmetic, var, fvar, or Complex.
	Standard library types and traits
	require type traits that come from the standard library.
	Eigen
	require type traits to detect Eigen types.
	General Types
	require type traits for general types.
	Require Macro Generators
	These macros are used on type traits to define the set of requires
	OpenCL
	require type traits to detect types used with OpenCL.