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Annex B (informative)
Implementation quantities [implimits]
1 Because computers are finite, C++ implementations are inevitably limited in the size of the programs they
can successfully process. Every implementation shall document those limitations where known. This documentation
may cite fixed limits where they exist, say how to compute variable limits as a function of available
resources, or say that fixed limits do not exist or are unknown.
2 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. However, these quantities are
only guidelines and do not determine compliance.
— Nesting levels of compound statements, iteration control structures, and selection control structures
[256].
— Nesting levels of conditional inclusion [256].
— Pointer, array, and function declarators (in any combination) modifying a class, arithmetic, or incomplete
type in a declaration [256].
— Nesting levels of parenthesized expressions within a full-expression [256].
— Number of characters in an internal identifier or macro name [1 024].
— Number of characters in an external identifier [1 024].
— External identifiers in one translation unit [65 536].
— Identifiers with block scope declared in one block [1 024].
— Macro identifiers simultaneously defined in one translation unit [65 536].
— Parameters in one function definition [256].
— Arguments in one function call [256].
— Parameters in one macro definition [256].
— Arguments in one macro invocation [256].
— Characters in one logical source line [65 536].
— Characters in a string literal (after concatenation) [65 536].
— Size of an object [262 144].
— Nesting levels for #include files [256].
— Case labels for a switch statement (excluding those for any nested switch statements) [16 384].
— Data members in a single class [16 384].
— Enumeration constants in a single enumeration [4 096].
— Levels of nested class definitions in a single member-specification [256].