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C++ style guide: Difference between revisions
Add section for lambda expressions
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} | } | ||
</syntaxhighlight> | </syntaxhighlight> | ||
==== #ifdef directives ==== | |||
Indent code that follows a conditional processor directive such as {{codeline|#ifdef}} or {{codeline|#else}}. | |||
Example | |||
<syntaxhighlight lang="cpp"> | |||
#if defined (HAVE_CONFIG_H) | |||
# include "config.h" | |||
#endif | |||
</syntaxhighlight> | |||
The '#' character may also be placed with the directive rather than remaining in column 1 if this looks better. | |||
==== Split long expressions ==== | ==== Split long expressions ==== | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
|} | |} | ||
=== new/delete === | |||
Pointers that will be allocated memory with {{codeline|new}} should be initialized with the C++ literal {{codeline|nullptr}}, not the numerical value 0 or the macro {{codeline|NULL}}. | |||
The {{codeline|delete}} keyword accepts {{codeline|nullptr}} and programmers should not put an {{codeline|if (ptr)}} guard around {{codeline|delete}}. | |||
{| class="wikitable" | |||
! style="color:green;" | good | |||
! style="color:darkred;" | bad | |||
|- | |||
| <syntaxhighlight lang="c++"> | |||
delete ptr; | |||
</syntaxhighlight> | |||
| <syntaxhighlight lang="c++"> | |||
if (ptr) | |||
delete ptr; | |||
</syntaxhighlight> | |||
|} | |||
=== lambda expressions === | |||
When capturing variables from the surrounding function, explicitly list the variables being captured rather than relying on a default capture by value (`[=]`) or by reference (`[&]`). This more clearly captures the programmer's intent and makes the code more understandable. | |||
=== std::string === | === std::string === | ||