Concept BoundaryChecker

Concept BoundaryChecker

BoundaryChecker

Description

A BoundaryChecker is a function object that tells whether a position within a range constitutes a boundary.

Associated types

input_type
```
BoundaryChecker::input_type
```
The type of elements the boundary checker analyzes.

Notation

BoundaryChecker: A type playing the role of model of BoundaryChecker in the BoundaryChecker concept.
In: A type playing the role of model of Bidirectional Iterator with elements convertible to input_type in the BoundaryChecker concept.
b: Object of type BoundaryChecker
begin, end, pos: Objects of type In

Valid expressions

Name	Expression	Type	Precondition	Semantics
Construction	BoundaryChecker()	BoundaryChecker		Construct an instance of the type with default parameters.
Function Object Call	b(begin, end, pos)	bool	`begin != end && pos != begin && pos != end`	Returns whether `pos` is a boundary within the [`begin`, `end`[ range.

Models

boost::unicode::u8_boundary, boost::unicode::u16_boundary, boost::unicode::grapheme_boundary