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This commit is contained in:
koe 2022-12-26 11:36:44 -06:00
parent e5aa058a8d
commit f50b9e3803
1 changed files with 24 additions and 16 deletions
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40
src/common/container_helpers.h
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@ -45,8 +45,15 @@
namespace tools
{
/// convert an arbitrary function to functor
template <typename F>
inline auto as_functor(F f)
{
return [f = std::move(f)](auto&&... args) { return f(std::forward<decltype(args)>(args)...); };
}
/// convert a binary comparison function to a functor
template <typename T, typename ComparisonOpT = bool(const T &a, const T &b)>
/// note: for most use-cases 'const T&' will work because only non-trivial types need a user-defined comparison operation
template <typename T, typename ComparisonOpT = bool(const T&, const T&)>
inline auto compare_func(ComparisonOpT comparison_op_func)
{
static_assert(
@ -62,7 +69,7 @@ inline auto compare_func(ComparisonOpT comparison_op_func)
"invalid callable - expected callable in form bool(T, T)"
);
return [func = std::move(comparison_op_func)] (const T &a, const T &b) -> bool { return func(a, b); };
return as_functor(std::move(comparison_op_func));
}
/// test if a container is sorted and unique according to a comparison criteria (defaults to operator<)
/// NOTE: ComparisonOpT must establish 'strict weak ordering' https://en.cppreference.com/w/cpp/named_req/Compare
@ -88,7 +95,7 @@ bool is_sorted_and_unique(const T &container, ComparisonOpT comparison_op = Comp
if (std::adjacent_find(container.begin(),
container.end(),
[comparison_op](const ValueT &a, const ValueT &b) -> bool
[comparison_op = std::move(comparison_op)](const ValueT &a, const ValueT &b) -> bool
{
return !comparison_op(a, b) && !comparison_op(b, a);
})
@ -100,31 +107,32 @@ bool is_sorted_and_unique(const T &container, ComparisonOpT comparison_op = Comp
/// specialization for raw function pointers
template <typename T>
bool is_sorted_and_unique(const T &container,
bool (*const comparison_op_func)(const typename T::value_type &a, const typename T::value_type &b))
bool (*const comparison_op_func)(const typename T::value_type&, const typename T::value_type&))
{
return is_sorted_and_unique(container, compare_func<typename T::value_type>(comparison_op_func));
}
/// convenience wrapper for checking if a mapped object is mapped to a key embedded in that object
/// convenience wrapper for checking if the key to a mapped object is correct for that object
/// example: std::unorderd_map<rct::key, std::pair<rct::key, rct::xmr_amount>> where the map key is supposed to
/// reproduce the pair's rct::key; use the predicate to get the pair's rct::key element
/// reproduce the pair's rct::key; use the predicate to check that relationship
template <typename KeyT, typename ValueT, typename PredT>
bool keys_match_internal_values(const std::unordered_map<KeyT, ValueT> &map, PredT get_internal_key_func)
bool keys_match_internal_values(const std::unordered_map<KeyT, ValueT> &map, PredT check_key_func)
{
static_assert(
std::is_same<
std::remove_cv_t<std::remove_reference_t<
KeyT
>>,
std::remove_cv_t<std::remove_reference_t<
decltype(get_internal_key_func(std::declval<std::remove_cv_t<std::remove_reference_t<ValueT>>>()))
>>
bool,
decltype(
check_key_func(
std::declval<std::remove_cv_t<KeyT>>(),
std::declval<std::remove_cv_t<ValueT>>()
)
)
>::value,
"invalid callable - expected callable in form Key(Value)"
"invalid callable - expected callable in form bool(KeyT, ValueT)"
);
for (const auto &map_element : map)
{
if (!(map_element.first == get_internal_key_func(map_element.second)))
if (!check_key_func(map_element.first, map_element.second))
return false;
}
@ -145,7 +153,7 @@ void for_all_in_map_erase_if(std::unordered_map<KeyT, ValueT> &map_inout, PredT
static_assert(
std::is_same<
bool,
decltype(predicate(std::declval<std::remove_cv_t<std::remove_reference_t<MapValueT>>>()))
decltype(predicate(std::declval<std::remove_cv_t<MapValueT>>()))
>::value,
"invalid callable - expected callable in form bool(Value)"
);