Nesting levels of compound statements ([stmt.block]), iteration control structures ([stmt.iter]), and selection control structures ([stmt.select]) [256].

Nesting levels of conditional inclusion ([cpp.cond]) [256].

Pointer ([dcl.ptr]), pointer-to-member ([dcl.mptr]), array ([dcl.array]), and function ([dcl.fct]) declarators (in any combination) modifying a type in a declaration [256].

Nesting levels of parenthesized expressions ([expr.prim.paren]) within a full-expression [256].

Number of characters in an internal identifier ([lex.name]) or macro name ([cpp.replace]) [1 024].

Number of characters in an external identifier ([lex.name], [basic.link]) [1 024].

External identifiers ([basic.link]) in one translation unit [65 536].

Identifiers with block scope declared in one block ([basic.scope.block]) [1 024].

Structured bindings ([dcl.struct.bind]) introduced in one declaration [256].

Macro identifiers ([cpp.replace]) simultaneously defined in one translation unit [65 536].

Parameters in one function definition ([dcl.fct.def.general]) [256].

Arguments in one function call ([expr.call]) [256].

Parameters in one macro definition ([cpp.replace]) [256].

Arguments in one macro invocation ([cpp.replace]) [256].

Characters in one logical source line ([lex.phases]) [65 536].

Characters in a string-literal ([lex.string]) (after concatenation ([lex.phases])) [65 536].

Size of an object ([intro.object]) [262 144].

Nesting levels for #include files ([cpp.include]) [256].

Case labels for a switch statement ([stmt.switch]) (excluding those for any nested switch statements) [16 384].

Non-static data members (including inherited ones) in a single class ([class.mem]) [16 384].

Lambda-captures in one lambda-expression ([expr.prim.lambda.capture]) [256].

Enumeration constants in a single enumeration ([dcl.enum]) [4 096].

Levels of nested class definitions ([class.nest]) in a single member-specification [256].

Functions registered by atexit() ([support.start.term]) [32].

Functions registered by at_quick_exit() ([support.start.term]) [32].

Direct and indirect base classes ([class.derived]) [16 384].

Direct base classes for a single class ([class.derived]) [1 024].

Class members declared in a single member-specification (including member functions) ([class.mem]) [4 096].

Final overriding virtual functions in a class, accessible or not ([class.virtual]) [16 384].

Direct and indirect virtual bases of a class ([class.mi]) [1 024].

Static data members of a class ([class.static.data]) [1 024].

Friend declarations in a class ([class.friend]) [4 096].

Access control declarations in a class ([class.access.spec]) [4 096].

Member initializers in a constructor definition ([class.base.init]) [6 144].

initializer-clauses in one braced-init-list ([dcl.init]) [16 384].

Scope qualifications of one identifier ([expr.prim.id.qual]) [256].

Nested linkage-specifications ([dcl.link]) [1 024].

Recursive constexpr function invocations ([dcl.constexpr]) [512].

Full-expressions evaluated within a core constant expression ([expr.const.core]) [1 048 576].

Template parameters in a template declaration ([temp.param]) [1 024].

Recursively nested template instantiations ([temp.inst]), including substitution during template argument deduction ([temp.deduct]) [1 024].

Handlers per try block ([except.handle]) [256].

Number of placeholders [10].

Number of hazard-protectable possibly-reclaimable objects ([saferecl.hp.general]) [256].