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ISO C++ core guideline T.20https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#t20-avoid-concepts-without-meaningful-semantics
1 Conceptshttps://en.cppreference.com/w/cpp/language/constraints#Concepts
2 Constraintshttps://en.cppreference.com/w/cpp/language/constraints#Constraints
2.1 Redeclarationshttps://en.cppreference.com/w/cpp/language/constraints#Redeclarations
2.2 Conjunctionshttps://en.cppreference.com/w/cpp/language/constraints#Conjunctions
2.3 Disjunctionshttps://en.cppreference.com/w/cpp/language/constraints#Disjunctions
2.4 Atomic constraintshttps://en.cppreference.com/w/cpp/language/constraints#Atomic_constraints
2.5 Fold expanded constraintshttps://en.cppreference.com/w/cpp/language/constraints#Fold_expanded_constraints
2.6 Constraint normalizationhttps://en.cppreference.com/w/cpp/language/constraints#Constraint_normalization
3 requires clauseshttps://en.cppreference.com/w/cpp/language/constraints#requires_clauses
4 Partial ordering of constraintshttps://en.cppreference.com/w/cpp/language/constraints#Partial_ordering_of_constraints
5 Noteshttps://en.cppreference.com/w/cpp/language/constraints#Notes
6 Keywordshttps://en.cppreference.com/w/cpp/language/constraints#Keywords
7 Defect reportshttps://en.cppreference.com/w/cpp/language/constraints#Defect_reports
8 See alsohttps://en.cppreference.com/w/cpp/language/constraints#See_also
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