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Item 2. Case-Insensitive Strings桺art 1

Difficulty: 7

So you want a case-insensitive string class? Your mission, should you choose to accept it, is to write one.

This Item is composed of three related points.

What does "case-insensitive" mean?
Write a ci_string class that is identical to the standard std::string class but that is case-insensitive in the same way as the commonly provided extension stricmp().^[1] A ci_string should be usable as follows:
^[1] The stricmp() case-insensitive string comparison function is not part of the C or C++ standards, but it is a common extension on many C and C++ compilers.
```
ci_string s( "AbCdE" ); 


// case insensitive


//


assert( s == "abcde" );


assert( s == "ABCDE" );


// still case-preserving, of course


//


assert( strcmp( s.c_str(), "AbCdE" ) == 0 );


assert( strcmp( s.c_str(), "abcde" ) != 0 );
```
Is making case sensitivity a property of the object a good idea?

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