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Most compilers will generate a warning if either of the following cases holds (generally, this requires turning on a warning mode of the compiler) 1 The definition of the function makes it inherently impossible to be inlined For example, the compiler may complain that the function is too complex to inline In this case, if possible, rewrite the function; otherwise, remove the inline specification and place the function definition within a program text file 2 A particular call of the function cannot be inlined For example, on the original C++ implementation from AT&T (cfront), a second call of an inline function within the same expression is not inlined In this case, the expression can be rewritten to separate the two inline function calls Before you declare a function inline, you must analyze its run-time behavior Making sure that the function is really inlined is a necessary part of writing programs We recommend that an inherently uninlineable function not be declared inline and not be placed in a header file
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Exercise 83
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Identify which ones of the following are declarations and which ones are definitions Explain why they are declarations or definitions
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(a) (b) (c) (d) (e)
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extern int ix = 1024; int iy; extern void reset( void *p ) { /* */ } extern const int *pi; void print( const matrix & );
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Exercise 84
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Which one of the following declarations and definitions would you put in a header file In a program text file Explain why
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int var; inline bool is_equal( const SmallInt &, const SmallInt & ) { } void putValues( int *arr, int size ); const double pi = 31416; extern int total = 255;
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A variable declaration in local scope introduces a local object There are three kinds of local objects: automatic objects, register objects, and local static objects What distinguishes these objects is the lifetime and properties of the storage in which the objects reside The storage in which an automatic object resides lasts from the time the function in which it is declared is invoked to the time the function exits A register object is an automatic object for which fast read and store of the object's value are supported A local static object resides in storage that lasts for the entire duration of the program In this section, we examine the properties of these three kinds of local objects Automatic Objects An automatic object has its storage allocated at the time the function in which it is defined is invoked Storage for an automatic object is allocated from the program's run-time stack and is part of the activation record of the function Automatic objects are said to have
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automatic storage duration, or automatic extent An uninitialized automatic object contains a random bit pattern left over from the previous use of that storage Its value is spoken of as unspecified Upon termination of the function, its activation record is popped from the run-time stack In effect, the storage associated with the automatic object is deallocated The object's lifetime ends upon the termination of the function Any value it contains is discarded Because the storage associated with automatic objects is deallocated upon termination of the function, the address of an automatic object should be used with caution The address of an automatic object should never be the return value of a function, because, once the function exits, the address refers to invalid storage For example:
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#include "Matrixh" Matrix* trouble( Matrix *pm ) { Matrix res; // do something using pm // assign the result to res return &res; // bad! } int main() { Matrix m1; // Matrix *mainResult = trouble( &m1 ); // }
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mainResult is set to the address of the automatic Matrix object res Unfortunately, the storage of res is deallocated on completion of trouble() On the return to main(), mainResult is addressing technically unallocated memory (In this example, the address may still remain valid because we have not yet invoked another function to overlay some or all of the activation record allocated to support trouble(), making such an error more difficult to detect) Using mainResult later in main() will yield surprising results However, passing the address of main()'s automatic object m1 to the function trouble() is always safe The storage for main() is guaranteed to remain on the stack for the duration of the call to trouble(), and the memory for m1 remains accessible for the duration of the call to trouble() When the address of an automatic object is stored in a pointer with a lifetime longer than that of the automatic object, the pointer is said to be a dangling pointer This is a serious programmer error, because the contents of the addressed memory are unpredictable If the bits at that address are somehow relevant (so that the program does not generate a segment fault, for example), the program may run to completion but provide invalid results Register Automatic Objects Automatic objects used heavily within a function can be declared with the keyword register If possible, the compiler will load the object into a machine register If it cannot, the object remains in memory Array indexes and pointers occurring within a loop are good candidates for register objects
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for ( register int ix = 0; ix < sz; ++ix ) // for (register int *p = array ; p < arraySize; ++p ) //
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