# Conformance to the C/C++ Standards

The Intel® C++ Compiler Classic conforms to the following ANSI/ISO standards:

- C++ ISO/IEC 14882:1998

- C ISO/IEC 9899:1990

provides conformance to the ANSI/ISO standard for C language compilation (ISO/IEC 9899:1990). This standard requires that conforming C compilers accept minimum translation limits. This compiler exceeds all of the ANSI/ISO requirements for minimum translation limits.

## C++ Support

The Intel® C++ Compiler Classic supports many features in C++11. For a list of support features, see C++ Features Supported by Intel® C++ Compiler at http://software.intel.com/en-us/articles/c0x-features-supported-by-intel-c-compiler.

Template Instatiation

The Intel® C++ Compiler Classic supports `extern` template, which lets you specify that a template in a specific translation unit will not be instantiated because it will be instantiated in a different translation unit or different library. The compiler now includes additional support for:

- inline template – instantiates the compiler support data for the class (example: vtable) for a class without instantiating its members.

- static template – instantiates the static data members of the template, but not the virtual tables or member functions.

You can now use the following options to gain more control over the point of template instantiation:

Option | Description
--- | ---
-fno-implicit-templates | Never emit code for non-inline templates which are instantiated implicitly (example: by use). Only emit code for explicit instantiations.
-fno-implicit-inline-templates | Do not emit code for implicit instantiations of inline templates either. The default is to handle inlines differently so that compilations, with and without optimization, will need the same set of explicit instantiations.

## C99 Support

The following C99 features are supported in this version of the Intel® C++ Compiler Classic:

- restricted pointers (`restrict` keyword).

- variable-length Arrays

- flexible array members

- complex number support (`_Complex` keyword)

- hexadecimal floating-point constants

- compound literals

- designated initializers

- mixed declarations and code

- macros with a variable number of arguments

- inline functions (`inline` keyword)

- boolean type (`_Bool` keyword)

These long double (128-bit representations) feature is not supported:

Parent topic: Compatibility and Portability

## See Also

-fno-implicit-templates compiler option
-fno-implicit-inline-templates compiler option