Segmentation

template<BoundaryCondition Break>
constexpr auto max_lookbehind_v

The maximum number of code points preceding a position that need to be checked to determine whether a boundary exists according to Break.

template<BoundaryCondition Break>
constexpr auto max_lookahead_v

The maximum number of code points succeeding a position that need to be checked to determine whether a boundary exists according to Break.

template<BoundaryCondition Break>
bool is_boundary_ignorable(code_point previous, code_point current)

Warning

This part of the interface is still being worked out; it is likely to change signficantly or to be removed before the next release.

Tests whether a code point is ignorable when determining boundaries.

Parameters:

• previous – the code point that occurs before the one being tested
• current – the code point being tested

Returns:

true if current can be ignored to determine boundaries when following previous; false otherwise.

template<BoundaryCondition Break, RandomAccessRange Rng>
bool is_boundary(Rng rng)

Warning

This part of the interface is still being worked out; it is likely to change signficantly or to be removed before the next release.

Tests whether a boundary exists at a given position in a range of code points.

Parameters:rng – the range of code points to check for a boundary. This range contains some code points before the position to be checked and some after it, as determined by var:max_lookbehind_v and var:max_lookahead_v. Returns:true if a boundary exists at the position checked, according to Break; false otherwise.

template<typename Break, typename Rng>
auto boundaries(Rng rng)

..todo:: docs