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Merge pull request #54 from lichray/less-sfinae

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Finishing cleanup by refactoring SFINAE into constexpr-if
This commit is contained in:
Pranav Srinivas Kumar 2019-11-17 22:17:13 -06:00 committed by GitHub
commit 6ee8de5f4e
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1 changed files with 36 additions and 58 deletions
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72
include/argparse.hpp
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@ -70,10 +70,9 @@ 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>;
struct is_string_like
: std::conjunction<std::is_constructible<std::string, T>,
std::is_convertible<T, std::string_view>> {};
template <class F, class Tuple, class Extra, size_t... I>
constexpr decltype(auto) apply_plus_one_impl(F &&f, Tuple &&t, Extra &&x,
@ -115,8 +114,7 @@ public:
template <typename... Args,
std::enable_if_t<
std::conjunction_v<std::is_constructible<std::string, Args>...>,
int> = 0>
std::conjunction_v<details::is_string_like<Args>...>, int> = 0>
explicit Argument(Args &&... args)
: Argument({std::string(std::forward<Args>(args))...},
std::make_index_sequence<sizeof...(Args)>{}) {}
@ -262,22 +260,13 @@ public:
}
/*
* Entry point for template non-container types
* Compare to an argument value of known type
* @throws std::logic_error in case of incompatible types
*/
template <typename T>
std::enable_if_t<!details::is_container_v<T>, bool>
operator==(const T &aRhs) const {
template <typename T> bool operator==(const T &aRhs) const {
if constexpr (!details::is_container_v<T>) {
return get<T>() == aRhs;
}
/*
* Template specialization for containers
* @throws std::logic_error in case of incompatible types
*/
template <typename T>
std::enable_if_t<details::is_container_v<T>, bool>
operator==(const T &aRhs) const {
} else {
using ValueType = typename T::value_type;
auto tLhs = get<T>();
return std::equal(std::begin(tLhs), std::end(tLhs), std::begin(aRhs),
@ -285,6 +274,7 @@ public:
return std::any_cast<const ValueType &>(lhs) == rhs;
});
}
}
private:
static bool is_integer(const std::string &aValue) {
@ -317,11 +307,14 @@ private:
}
/*
* Getter for template non-container types
* Get argument value given a type
* @throws std::logic_error in case of incompatible types
*/
template <typename T> details::enable_if_not_container<T> get() const {
template <typename T> T get() const {
if (!mValues.empty()) {
if constexpr (details::is_container_v<T>)
return any_cast_container<T>(mValues);
else
return std::any_cast<T>(mValues.front());
}
if (mDefaultValue.has_value()) {
@ -330,31 +323,16 @@ private:
throw std::logic_error("No value provided");
}
/*
* Getter for container types
* @throws std::logic_error in case of incompatible types
*/
template <typename CONTAINER>
details::enable_if_container<CONTAINER> get() const {
using ValueType = typename CONTAINER::value_type;
CONTAINER tResult;
if (!mValues.empty()) {
template <typename T>
static auto any_cast_container(const std::vector<std::any> &aOperand) -> T {
using ValueType = typename T::value_type;
T tResult;
std::transform(
std::begin(mValues), std::end(mValues), std::back_inserter(tResult),
begin(aOperand), end(aOperand), std::back_inserter(tResult),
[](const auto &value) { return std::any_cast<ValueType>(value); });
return tResult;
}
if (mDefaultValue.has_value()) {
const auto &tDefaultValues =
std::any_cast<const CONTAINER &>(mDefaultValue);
std::transform(std::begin(tDefaultValues), std::end(tDefaultValues),
std::back_inserter(tResult), [](const auto &value) {
return std::any_cast<ValueType>(value);
});
return tResult;
}
throw std::logic_error("No value provided");
}
std::vector<std::string> mNames;
std::string mUsedName;
@ -561,11 +539,11 @@ private:
tCompoundArgument[1] != '-') {
++it;
for (size_t j = 1; j < tCompoundArgument.size(); j++) {
auto tCurrentArgument = std::string{'-', tCompoundArgument[j]};
if (auto tIterator = mArgumentMap.find(tCurrentArgument);
tIterator != mArgumentMap.end()) {
auto tArgument = tIterator->second;
it = tArgument->consume(it, end, tCurrentArgument);
auto tHypotheticalArgument = std::string{'-', tCompoundArgument[j]};
auto tIterator2 = mArgumentMap.find(tHypotheticalArgument);
if (tIterator2 != mArgumentMap.end()) {
auto tArgument = tIterator2->second;
it = tArgument->consume(it, end, tHypotheticalArgument);
} else {
throw std::runtime_error("Unknown argument");
}