easylocal::cost::operator-
delta(candidate, current), when the soft cost has a delta.
Synopsis
Declared in <easylocal/cost/hierarchical.hpp>
[[nodiscard]]
constexpr
auto
operator-(
hierarchical const& candidate,
hierarchical const& current)
requires has_delta<hierarchical>;NOTE
This function is a hidden friend of hierarchical, declared only inside that class: it can be found only through argument-dependent lookup.
Return Value
NOTE
The return value should not be discarded.