google python/c++ code style naming
python:
Guidelines derived from Guido's Recommendations
Type | Public | Internal |
---|---|---|
Packages | lower_with_under |
|
Modules | lower_with_under |
_lower_with_under |
Classes | CapWords |
_CapWords |
Exceptions | CapWords |
|
Functions | lower_with_under() |
_lower_with_under() |
Global/Class Constants | CAPS_WITH_UNDER |
_CAPS_WITH_UNDER |
Global/Class Variables | lower_with_under |
_lower_with_under |
Instance Variables | lower_with_under |
_lower_with_under (protected) or __lower_with_under (private) |
Method Names | lower_with_under() |
_lower_with_under() (protected) or __lower_with_under() (private) |
Function/Method Parameters | lower_with_under |
|
Local Variables | lower_with_under |
c++:
File Names:
my_useful_class.cc
my-useful-class.cc
myusefulclass.cc
myusefulclass_test.cc // _unittest and _regtest are deprecated.
url_table.h // The class declaration.
url_table.cc // The class definition.
url_table-inl.h // Inline functions that include lots of code.
classes and structs:
// classes and structs
class UrlTable { ...
class UrlTableTester { ...
struct UrlTableProperties { ... // typedefs
typedef hash_map<UrlTableProperties *, string> PropertiesMap; // enums
enum UrlTableErrors { ...
Variable Names:
Common Variable names For example: string table_name; // OK - uses underscore.
string tablename; // OK - all lowercase.
string tableName; // Bad - mixed case.
Class Data Members Data members (also called instance variables or member variables) are lowercase with optional underscores like regular variable names, but always end with a trailing underscore. string table_name_; // OK - underscore at end.
string tablename_; // OK.
Struct Variables Data members in structs should be named like regular variables without the trailing underscores that data members in classes have. struct UrlTableProperties {
string name;
int num_entries;
}
Constant Names
Use a k followed by mixed case: kDaysInAWeek.
All compile-time constants, whether they are declared locally, globally, or as part of a class, follow a slightly different naming convention from other variables. Use a k followed by words with uppercase first letters: const int kDaysInAWeek = ;
Function Names
Regular Functions Functions should start with a capital letter and have a capital letter for each new word. No underscores. If your function crashes upon an error, you should append OrDie to the function name. This only applies to functions which could be used by production code and to errors that are reasonably likely to occur during normal operation. AddTableEntry()
DeleteUrl()
OpenFileOrDie()
Accessors and Mutators Accessors and mutators (get and set functions) should match the name of the variable they are getting and setting. This shows an excerpt of a class whose instance variable is num_entries_. class MyClass {
public:
...
int num_entries() const { return num_entries_; }
void set_num_entries(int num_entries) { num_entries_ = num_entries; } private:
int num_entries_;
};
You may also use lowercase letters for other very short inlined functions. For example if a function were so cheap you would not cache the value if you were calling it in a loop, then lowercase naming would be acceptable.
Enumerator Names
Preferably, the individual enumerators should be named like constants. However, it is also acceptable to name them like macros. The enumeration name, UrlTableErrors (and AlternateUrlTableErrors), is a type, and therefore mixed case. enum UrlTableErrors {
kOK = ,
kErrorOutOfMemory,
kErrorMalformedInput,
};
enum AlternateUrlTableErrors {
OK = ,
OUT_OF_MEMORY = ,
MALFORMED_INPUT = ,
};
Macro Names
You're not really going to define a macro, are you? If you do, they're like this: MY_MACRO_THAT_SCARES_SMALL_CHILDREN.
Please see the description of macros; in general macros should not be used. However, if they are absolutely needed, then they should be named with all capitals and underscores. #define ROUND(x) ...
#define PI_ROUNDED 3.0
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