__inline

 The __inline modifier marks a function for inline expansion.  Using
 __inline on a function definition and prototype tells the compiler
 that it can substitute the code within the function definition for
 every call to that function.  Substitution occurs at the discretion
 of the compiler.  The __inline storage-class specifier has the same
 effect as the #pragma inline preprocessor directive, except that
 the latter attempts to provide inline expansion for all functions
 in a translation unit, rather than for selected functions.

 Syntax:

      __inline [type] function_definition