C General - Determing the Size of Allocated Memory Blocks

Determing the Size of Allocated Memory Blocks

Q

How can you determine the size of an allocated portion of memory?

✍: FYIcenter

A

You can't, really. free() can , but there's no way for your program to know the trick free() uses. Even if you disassemble the library and discover the trick, there�s no guarantee the trick won�t change with the next release of the compiler.

2007-02-26, 5767👍, 0💬

Can Static Variables Be Declared in Header Files
Can static variables be declared in a header file? You can't declare a static variable without defining it as well (this is because the storage class modifiers static and extern are mutually exclusive). A static variable can be defined in a header file, but this would cause each source file that inc... 2007-02-26, 6607👍, 0💬

What is page thrashing
What is page thrashing? Some operating systems (such as UNIX or Windows in enhanced mode) use virtual memory. Virtual memory is a technique for making a machine behave as if it had more memory than it really has, by using disk space to simulate RAM (random-access memory). In the 80386 and higher Int... 2007-02-26, 5974👍, 0💬

Overriding Defined Macros
How do you override a defined macro? You can use the #undef preprocessor directive to undefine (override) a previously defined macro. 2007-02-26, 5833👍, 0💬

Determing the Size of Allocated Memory Blocks
How can you determine the size of an allocated portion of memory? You can't, really. free() can , but there's no way for your program to know the trick free() uses. Even if you disassemble the library and discover the trick, there�s no guarantee the trick won�t change with the next release of the co... 2007-02-26, 5768👍, 0💬

All rights in the contents of this web site are reserved by the individual author. fyicenter.com does not guarantee the truthfulness, accuracy, or reliability of any contents.