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title Compiler Limits | Microsoft Docs
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ms.date 11/04/2016
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cpp-language
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Compiler Limits

The C++ standard recommends limits for various language constructs. The following is a list of cases where the Visual C++ compiler does not implement the recommended limits. The first number is the limit that is established in the ISO C++ 11 standard (INCITS/ISO/IEC 14882-2011[2012], Annex B) and the second number is the limit implemented by Visual C++:

  • Nesting levels of compound statements, iteration control structures, and selection control structures - C++ standard: 256, Visual C++ compiler: depends on the combination of statements that are nested, but generally between 100 and 110.

  • Parameters in one macro definition - C++ standard: 256, Visual C++ compiler: 127.

  • Arguments in one macro invocation - C++ standard: 256, Visual C++ compiler 127.

  • Characters in a character string literal or wide string literal (after concatenation) - C++ standard: 65536, Visual C++ compiler: 65535 single-byte characters, including the null terminator, and 32767 double-byte characters, including the null terminator.

  • Levels of nested class, structure, or union definitions in a single struct-declaration-list - C++ standard: 256, Visual C++ compiler: 16.

  • Member initializers in a constructor definition - C++ standard: 6144, Visual C++ compiler: at least 6144.

  • Scope qualifications of one identifier - C++ standard: 256, Visual C++ compiler: 127.

  • Nested extern specifications - C++ standard: 1024, Visual C++ compiler: 9 (not counting the implicit extern specification in global scope, or 10, if you count the implicit extern specification in global scope..

  • Template arguments in a template declaration - C++ standard: 1024, Visual C++ compiler: 2046.

See Also

Nonstandard Behavior