to be defined in the one and only .cc file that instantiates the template. There are rare cases where a file is not meant to be self-contained, but it is meant to be included at a specific point in the FOO_BAR_BAZ_H_ ... #endif // FOO_BAR_BAZ_H_ Forward Declarations Avoid using forward declarations where possible. Just #include the headers you need. A “forward declaration” is a declaration of a class namespaces, in particular, can be confusing because names aren’t actually restricted to the namespace where they are declared. They are only useful as part of some larger versioning policy. Use of unnamed

optionally be treated as if it were a block-like construct. 4 4.1 Braces 4.1.1 Braces are used where optional Braces are used with if, else, for, do and while statements, even when the body is empty this limit must be line-wrapped, as explained in Section 4.5, Line-wrapping. Exceptions: 1. Lines where obeying the column limit is not possible (for example, a long URL in Javadoc, or a long JSNI method Extracting a method or local variable may solve the problem without the need to line-wrap. 4.5.1 Where to break The prime directive of line-wrapping is: prefer to break at a higher syntactic level. Also:

the identifier for the unused argument or prefixing the argument name with ‘unused_’. In situations where changing the argument names is infeasible, you can mention them at the beginning of the function. inconveniently long. Decision: Use import x for importing packages and modules. Use from x import y where x is the package prefix and y is the module name 3 with no prefix. Use from x import y as z if two argv has not yet been parsed... ... Properties link￿ Use properties for accessing or setting data where you would normally have used simple, lightweight accessor or setter methods. Definition: A way to

y-axis at 0 for linear scale Experiments and Result Presentation Runtime What are the units? Where are the tics? Runtime [s] 80 90 100 Yours Mine This is a misleading y axis Runtime [s] 0

Probabilistic Inference. PVLDB 10(11) 2017  #13.6 Ziawasch Abedjan et al: Detecting Data Errors: Where are we and what needs to be done? PVLDB 9(12) 2016  Query Optimization  #14.1 Ryan Marcus, Parimarjan