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Enable equality operator for all iterable types

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This commit is contained in:
Stephan van Veen 2019-05-13 21:50:53 +02:00
parent 94ca8e2552
commit ca68260ec4
1 changed files with 32 additions and 23 deletions
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55
include/argparse.hpp
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@ -52,6 +52,31 @@ struct is_specialization : std::false_type {};
template<template<typename...> class Ref, typename... Args> template<template<typename...> class Ref, typename... Args>
struct is_specialization<Ref<Args...>, Ref> : std::true_type {}; struct is_specialization<Ref<Args...>, Ref> : std::true_type {};
template<typename... Ts>
struct is_container_helper {};
template<typename T, typename _ = void>
struct is_container : std::false_type {};
template<typename T>
struct is_container<T, std::conditional_t<
false, is_container_helper<
typename T::value_type,
decltype(std::declval<T>().begin()),
decltype(std::declval<T>().end()),
decltype(std::declval<T>().size())
>, void>> : public std::true_type {
};
template<typename T>
static constexpr bool is_container_v = is_container<T>::value;
template <typename T>
using enable_if_container = std::enable_if_t<is_container_v<T>, T>;
template <typename T>
using enable_if_not_container = std::enable_if_t<!is_container_v<T>, T>;
// Check if string (haystack) starts with a substring (needle) // Check if string (haystack) starts with a substring (needle)
bool starts_with(const std::string& haystack, const std::string& needle) { bool starts_with(const std::string& haystack, const std::string& needle) {
return needle.length() <= haystack.length() return needle.length() <= haystack.length()
@ -129,38 +154,22 @@ public:
// Entry point for template types other than std::vector and std::list // Entry point for template types other than std::vector and std::list
template <typename T> template <typename T>
typename std::enable_if<!is_specialization<T, std::vector>::value && std::enable_if_t <!is_container_v<T>, bool>
!is_specialization<T, std::list>::value, bool>::type operator==(const T& aRhs) const {
operator==(const T& aRhs) const {
return get<T>() == aRhs; return get<T>() == aRhs;
} }
// Template specialization for std::vector<...> // Template specialization for containers
template <typename T> template <typename T>
typename std::enable_if<is_specialization<T, std::vector>::value, bool>::type std::enable_if_t <is_container_v<T>, bool>
operator==(const T& aRhs) const { operator==(const T& aRhs) const {
using ValueType = typename T::value_type; using ValueType = typename T::value_type;
T tLhs = get<T>(); auto tLhs = get<T>();
if (tLhs.size() != aRhs.size()) if (tLhs.size() != aRhs.size())
return false; return false;
else { else {
return std::equal(std::begin(tLhs), std::begin(tLhs), std::begin(aRhs), [](const auto& lhs, const auto& rhs) { return std::equal(std::begin(tLhs), std::end(tLhs), std::begin(aRhs), [](const auto& lhs, const auto& rhs) {
return std::any_cast<ValueType>(lhs) == rhs; return std::any_cast<const ValueType&>(lhs) == rhs;
});
}
}
// Template specialization for std::list<...>
template <typename T>
typename std::enable_if<is_specialization<T, std::list>::value, bool>::type
operator==(const T& aRhs) const {
using ValueType = typename T::value_type;
T tLhs = get<T>();
if (tLhs.size() != aRhs.size())
return false;
else {
return std::equal(std::begin(tLhs), std::begin(tLhs), std::begin(aRhs), [](const auto& lhs, const auto& rhs) {
return std::any_cast<ValueType>(lhs) == rhs;
}); });
} }
} }