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CPString

The CPString is a C++ class that encapsulates the memory allocation necessary for string

handling and multi-byte string handling, while still providing access to a raw character

buffer.

The character buffer is dynamically allocated, and may be reallocated when the string is

modified. If the string is modified, destroyed, or goes out of scope, any saved reference

to the string (a saved value from Text() or an iterator) should be considered invalid. The

exception is if an iterator is passed by reference to the operator that modified the string,

the iterator will be automatically updated.

CPString is not a reference counted string. If you pass a CPString as an argument to a

function it will make a complete copy of that string. This is not very efficient and can

waste a lot of memory. If you plan on passing a CPString as an argument to a function

you should pass it as a constant reference. For example:

void MyFunction(const CPString& str)

{

... do something ...

}

Constructors and Assignment

To create a new CPString you can use one of the following constructors:

CPString();

CPString(CPMCHAR c);

CPString(const PEGCHAR* s);

CPString(const CPString& y);

CPString(OBCD d, int num_digits);

Instead of explicitly creating a string with a constructor, the assignment and

concatenation characters are also defined as:

CPString& operator=(const CPString& y);

CPString& operator+=(const CPString& y);

CPString& operator+=(const PEGCHAR *y);

Here are some examples of creating CPStrings:

CPString str1;

str1 = "Hello world.";

str1 += " How are you?"; //str1 now equals “Hello world. How are you?”

CPString str2("I am fine.");

CPString str3(str2); //str2=str3=”I am fine.”

Casio ClassPad 300 Programming Guide

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