Question

1) What is the convention used in practice when typedef’ing

something like

typedef std::map<SomeClass*, SomeOtherClass>  [SomeStandardName>]
typedef std::map<SomeClass*, std<SomeOtherClass> >  <[SomeStandardName]

2) Where do you usually put typedef: header files globally, local to the class?

3) Do you typedef iterators or const map<> version?

4) Say you have map that used by two different concepts, do you create two separate typedefs them?

typedef map<string, SomeClass *> IDToSomeClassMap;
typedef map<string, SomeClass *> DescriptionToSomeClassMap;

Thanks

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Edit #1

I am interested specifically in typedef STL maps, such as

typedef map<int, string> IdToDescriptionMap

or

typedef map<int, string> IdToDescription

What are common practices?

Answer 1

I prefer the following convention:

typedef std::map< Foo, Bar > FooToBarMap

I purposely avoid typedef’ing the iterators, I prefer explicitly referring to them as:

FooToBarMap::const_iterator

Since the iterators are already a de facto standard typename. And FooToBarMapConstIter is actually less clear to read when skimming code, I find.