How are dictionary literals created in Objective C?
Dictionary literals are similarly created with + [NSDictionary dictionaryWithObjects:forKeys:count:] which validates all objects and keys, unlike + [NSDictionary dictionaryWithObjectsAndKeys:] which also uses a nil parameter as an argument list terminator. Objective-C object pointer values can now be used with C’s subscripting operator.
How to create NSDictionary object in Objective-C?
In addition to the provided initializers, such as init (objects:forKeys:), you can create an NSDictionary object using a dictionary literal. In Objective-C, the compiler generates code that makes an underlying call to the init (objects:forKeys:count:) method.
How are boolean literals evaluated in Objective C?
In Objective-C, any character, numeric or boolean literal prefixed with the ‘@’ character will evaluate to a pointer to an NSNumber object initialized with that value. C’s type suffixes may be used to control the size of numeric literals.
What are the features of NSNumber literals in Clang?
Three new features were introduced into clang at the same time: NSNumber Literals provide a syntax for creating NSNumber from scalar literal expressions; Collection Literals provide a short-hand for creating arrays and dictionaries; Object Subscripting provides a way to use subscripting with Objective-C objects.
What is the type of a string literal in C?
In C, string literals are of type char, and can be assigned directly to a (non-const) char*. C++03 allowed it as well (but deprecated it, as literals are const in C++).
Can a string literal be assigned to a non const char?
String literals are convertible and assignable to non-const char* or wchar_t* in order to be compatible with C, where string literals are of types char[N] and wchar_t[N]. Such implicit conversion is deprecated. String literals are not convertible or assignable to non-const CharT*.