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The stackalloc Command
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The stackalloc command allocates memory from the stack and returns the address of the allocated memory. The returned address must be assigned to a local pointer variable as part of the variable's declaration. The stackalloc command takes an unmanaged data type and a quantity as arguments, calculates the size of the memory block to accommodate the specified number of instances, allocates memory from the stack, and returns a pointer to the newly allocated memory block. The initial content of the memory is undefined. The following code demonstrates a number of stackalloc operations:
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6. Advanced Language Features unsafe { //Allocate stack memory for 50 int values int* a = stackalloc int [50]; //Allocate stack memory for 30 char values char* b = stackalloc char [30]; }
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No mechanism exists to explicitly free memory allocated using the stackalloc command. Stack-allocated memory is freed when the function member returns.
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Summary
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This chapter has detailed advanced features of C#. Some of these features will be familiar to the Java developer, while many will be completely new unless the developer also has C/C++ experience. Although perhaps initially frustrated, the Java programmer should have little trouble adapting to the differences between Java and C# exception handling. It's possible that many programmers will never need to use preprocessor directives or unsafe code; however, an understanding of attributes is essential for developing applications for Microsoft .NET by using C#.
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Part III: Programming .NET with C#
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Strings and Regular Expressions Numbers and Dates Collections Streams, Files, and I/O XML Processing
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7. Strings and Regular Expressions
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7. Strings and Regular Expressions
Java and C# both recognize that string handling and manipulation are key functions required by almost every application, and they provide language-level support to make working with strings simple and a rich API to support advanced string manipulation. The basic capabilities of strings and the C# syntax used to manipulate them are covered in 4, "Language Syntax and Features." This chapter focuses on the Microsoft .NET System.String class and the functionality available in the Microsoft .NET class library for working with strings. Java developers will find support in .NET for all the string-handling mechanisms they are accustomed to in Java. This includes the more advanced features such as byte encoding, text formatting, and regular expressions. While there are many implementation differences, a Java developer will have little trouble adapting to the .NET methodology.
Strings
The .NET System.String class is equivalent to the java.lang.String class. Both classes offer predominantly the same functionality, although the implementation specifics present significant differences in how common tasks are accomplished. This section discusses and contrasts the functionality of both String classes in the context of describing everyday string manipulations. As pointed out in 4, the C# keyword string is an alias for the .NET System.String class; we'll use both conventions in the examples throughout this chapter.
Creating Strings
Both Java and C# support the use of assignment operators to create new instances of string objects from literals and other string instances, as illustrated in this fragment of C# code:
String someString = "This is a string."; String someOtherString = someString;
Notice that the .NET String class doesn't provide constructor equivalents of these assignment statements. The only other difference of note is the support .NET provides for creating a string given a pointer to a char or byte array. Because they use pointers, these constructors are unsafe. See the "Unsafe Code" section in 6, "Advanced Language Features," for details on unsafe code. Table 7-1 summarizes the Java and .NET string constructors.
7. Strings and Regular Expressions
Table 7-1. Creating Strings in Java and .NET
Comments The .NET String class doesn't provide empty constructor support. The static String.Copy method can be used, although it's easier to use direct assignment of an empty string. The .NET String class doesn't new String(String) String.Copy(String) provide a constructor that takes a String as an argument. The static String.Copy method can be used, although it's easier to use direct assignment. Takes a pointer to a byte array. new String(byte[]) new String(sbyte*) These constructors are unsafe because they use pointers. new String(byte[],int,int) new String(sbyte*,int,int) Reads from byte array using the new String(byte[], charset) new String(sbyte*,int,int,Encoding) specified encoding scheme. This constructor is unsafe because it new uses pointers. String(byte[],int,int,charset) Supports both a char array and a new String(char[]) new String(char[]) pointer to a char array. The two constructors that take pointers to new String(char[],int,int) new String(char[],int,int) char arrays are unsafe. new String(char*) String(char*,int,int) StringBuilder.ToString() String(char, int)
Java new String()
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