Range-based for loop
A range-based for loop is an iteration statement that traverses the elements of a range or container without explicit index or iterator management.
100 C++ Mistakes and How to Avoid Them
A range-based for loop is a C++ iteration statement that traverses the elements of a range or container without explicit index management.
- How it is used
- Replaces error-prone index mechanics with clearer traversal over container elements.
- How deep it goes
- Explains syntax, sequencing, copies, references, and const choices through a container-summing example.
- Examples
- Contrasts a vector sum using indexes with one using a const reference in a range-based loop.
- What you can do after
- Apply range-based for loops to traverse containers and select value, const-reference, or reference semantics appropriately.
Read how 100 C++ Mistakes and How to Avoid Them explains range-based for loop →
Learn C++ by Example
A range-based for loop iterates over the elements of a range or container without explicit iterator management.
- How it is used
- Uses a compact loop to walk through container elements while building and displaying vector-based programs.
- How deep it goes
- Explains practical traversal and its relationship to auto and ranges, but stops short of iterator-level implementation details.
- Examples
- Demonstrates traversal through vector values while constructing and displaying Pascal’s triangle.
- What you can do after
- Apply it via C++ to traverse containers without manually managing iterators or indices.
Read how Learn C++ by Example explains range-based for loop →
Related concepts
- iteratorcontrasts with · An iterator is an object or abstraction that provides successive values from a sequence or data source through a traversal protocol.
- off-by-one erroraddresses · An off-by-one error is a boundary or counting mistake in which an index, range, iteration, or computed value is exactly one too high or low.
- referenceuses · A reference is an indirect value or relationship that identifies or provides access to another value, object, resource, or source.
- containeruses · A container is a structure or entity that holds, groups, or packages other data or elements.
- loopcontrasts with · A loop is a programming control-flow construct that repeatedly executes a block of instructions according to an iteration rule or continuation condition.
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