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You can allocate memory from the stack by using stackalloc It can be used only when initializing local variables and has this general form: type* p = stackalloc type[size] Here, p is a pointer that receives the address of the memory that is large enough to hold size number of objects of type Also, type must be a nonreference type If there is not room on the stack to allocate the memory, a SystemStackOverflowException is thrown Finally, stackalloc can be used only in an unsafe context Normally, memory for objects is allocated from the heap, which is a region of free memory Allocating memory from the stack is the exception Variables allocated on the stack are not garbage-collected Rather, they exist only while the method in which they are declared is executing When the method is left, the memory is freed One advantage to using stackalloc is that you don t need to worry about the memory being moved about by the garbage collector Here is an example that uses stackalloc:

// Demonstrate stackalloc using System; class UseStackAlloc { unsafe static void Main() { int* ptrs = stackalloc int[3]; ptrs[0] = 1; ptrs[1] = 2; ptrs[2] = 3; for(int i=0; i < 3; i++) ConsoleWriteLine(ptrs[i]); } }

Adding numbers is an easy way to beef up your content It helps people understand your points and makes the text more believable

The output is shown here:

Notice that the function k can be thought of as two operations applied in sequence First we double and add 3, then we square Thus define f ( x) = 2x + 3 and g( x) = x 2 Then k( x) = ( g f ) ( x)

1 2 3

There is a second use of the fixed keyword that enables you to create fixed-sized, singledimensional arrays In the C# documentation, these are referred to as fixed-size buffers A fixedsize buffer is always a member of a struct The purpose of a fixed-size buffer is to allow the creation of a struct in which the array elements that make up the buffer are contained within the struct Normally, when you include an array member in a struct, only a reference to the array is actually held within the struct By using a fixed-size buffer, you cause the entire array to be contained within the struct This results in a structure that can be used in situations in which the size of a struct is important, such as in mixed-language programming, interfacing to data not created by a C# program, or whenever a nonmanaged struct containing an array is required Fixed-size buffers can be used only within an unsafe context

20:

U n s a f e C o d e , P o i n t e r s , N u l l a b l e Ty p e s , D y n a m i c Ty p e s , a n d M i s c e l l a n e o u s To p i c s

We can also compose three (or more) functions Define (h g f )(x) = h g ( f (x))

To create a fixed-size buffer, use this form of fixed: xed type buf-name[size];

Here, type is the data type of the array; buf-name is the name of the fixed-size buffer; and size is the number of elements in the buffer Fixed-size buffers can be specified only within a struct To understand why a fixed-size buffer might be useful, consider a situation in which you want to pass bank account information to an account management program that is written in C++ Furthermore, assume that each account record uses the following organization:

Name Balance ID An 8-bit, ASCII character string, 80 bytes long A double, 8 bytes long A long, 8 bytes long

Write the function k from the last example as the composition of three functions (instead of just two)