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adjust is_sorted_and_unique()

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This commit is contained in:
koe 2022-12-18 10:18:46 -06:00
parent 3d60475753
commit 73298734d6
1 changed files with 11 additions and 12 deletions
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23
src/common/container_helpers.h
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@ -47,21 +47,20 @@
namespace tools
{
/// use operator< to get operator==
/// WARNING: equality is not always implied by operator<, depending on implementation
struct equals_from_less final
/// test if a container is sorted and unique according to a comparison criteria (defaults to operator<)
template <typename T, typename ComparisonOpT = std::less<typename T::value_type>>
bool is_sorted_and_unique(const T &container, const ComparisonOpT &ComparisonOp = ComparisonOpT{})
{
template <typename T>
bool operator()(const T &a, const T &b) { return !(a < b) && !(b < a); }
};
/// note: test for sorted and uniqueness using the same criteria (operator<)
template <typename T>
bool is_sorted_and_unique(const T& container)
{
if (!std::is_sorted(container.begin(), container.end()))
if (!std::is_sorted(container.begin(), container.end(), ComparisonOp))
return false;
if (std::adjacent_find(container.begin(), container.end(), equals_from_less{}) != container.end())
if (std::adjacent_find(container.begin(),
container.end(),
[&ComparisonOp](const typename T::value_type &a, const typename T::value_type &b) -> bool
{
return !ComparisonOp(a, b) && !ComparisonOp(b, a);
})
!= container.end())
return false;
return true;