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Quick reference

Focused C++20 summaries for finding syntax and important distinctions quickly.

Topics

9 topics

Variables

  1. 01Variable initializationA quick comparison of C++ initialization forms.
  2. 09Scope, duration, and linkageThree simple questions for understanding where a name works, how long an object lives, and whether declarations share one entity.

Fundamental types

  1. 02Boolean valuesThe essential rules for true, false, conversion, and stream I/O.

Function parameters

  1. 03Choosing a parameter typeA quick guide to value, reference, and pointer parameters.
  2. 04Pass by valueGive a function its own value without modifying the caller's variable.
  3. 05Pass by const referenceRead an existing object without copying or modifying it.
  4. 06Pass by referenceLet a function modify an existing required object.
  5. 07Pass by pointerPass an object's address when the object may be optional.

Linkage

  1. 08Internal and external linkageDecide whether a global name stays within one translation unit or is shared across files.