Annex B (informative) Implementation quantities [implimits] (original) (raw)

The limits may constrain quantities that include those described below or others.

The bracketed number following each quantity is recommended as the minimum for that quantity.

• 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]), array ([dcl.array]), and function ([dcl.fct]) declarators (in any combination) modifying a class, arithmetic, or incomplete 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].
• 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].
• 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].
• Nesting levels for#includefiles ([cpp.include]) [256].
• Case labels for aswitchstatement ([stmt.switch]) (excluding those for any nestedswitchstatements) [16 384].
• Non-static data members (including inherited ones) in a single class ([class.mem]) [16 384].
• Enumeration constants in a single enumeration ([dcl.enum]) [4 096].
• Direct base classes for a single class ([class.derived]) [1 024].
• 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].
• Member initializers in a constructor definition ([class.base.init]) [6 144].
• Recursive constexpr function invocations ([dcl.constexpr]) [512].
• Full-expressions evaluated within a core constant expression ([expr.const]) [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].