Concepts

Here is a list of all documented concepts with brief descriptions:

Ncli
Nadl_detail
Rlexical_castable	Matches types with a lexical_cast overload findable by ADL
Ndetail
Rboolean_value_like	Matches types classified as a boolean
Rchar_value_like	Matches types classified as a single character
Rcomplex_like	Matches complex-number-like types, by their accessors
Rcomplex_number_like	Matches types classified as a complex number
Rcontainer_value_like	Matches types classified as a container
Rdirect_constructible	Matches types brace-constructible from C without narrowing
Rdouble_constructible_like	Matches types constructible from double only
Renumeration_like	Matches types classified as an enumeration
Rfloating_point_like	Matches types classified as floating point
Rhas_find	Matches containers offering their own find
Rinteger_constructible_like	Matches types constructible from int only
Rintegral_value_like	Matches types classified as a signed integer
Ristreamable	Matches types that can be read from an input stream
Rmutable_container	Matches containers that can be cleared and inserted into
Rnarrow_string_guard	Excludes narrow-string conversions when classifying wide strings
Rnumber_constructible_like	Matches types constructible from either int or double
Rostreamable	Matches types that can be written to an output stream
Rother_like	Matches types that fell through every other classification
Rpair_valued	Matches containers whose elements are pair-like
Rplain_object	Matches types with no string conversion and no stream insertion
Rreadable_container	Matches anything that can be iterated over
Rstring_assignable_like	Matches types assignable from std::string
Rstring_buildable	Matches types a std::string can be constructed from
Rstring_constructible_like	Matches types constructible from std::string
Rstring_convertible	Matches types implicitly convertible to std::string
Rstring_like_category	Matches the four string-like categories as a group
Rtext_like	Matches every string-like category, plus object_category_t::other
Rtuple_like	Matches types usable with std::tuple_size, excluding complex numbers
Rtuple_value_like	Matches types classified as a tuple
Runcommon	Matches types none of the ordinary categories claim
Runsigned_integral_like	Matches types classified as an unsigned integer
Rwide_string_guard	Excludes wide-string conversions when classifying narrow strings
Rwrapper_like	Matches types with a nested value_type, such as std::optional
Rwrapper_value_like	Matches types classified as a wrapper around a nested type
Rwstring_assignable_like	Matches types assignable from std::wstring
Rwstring_constructible_like	Matches types constructible from std::wstring
Rbool_like	Matches exactly bool, excluding types merely convertible to it
Rshared_ptr_like	Matches std::shared_ptr, with or without top-level const
Rcopyable_ptr	Matches pointer-like types that can be copied freely