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simplified traits using std::void_t

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This commit is contained in:
Mike Zozu 2020-12-15 20:01:26 +03:00
parent b025166e4c
commit 69c2cada35
1 changed files with 9 additions and 15 deletions
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24
include/argparse/argparse.hpp
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@ -53,34 +53,28 @@ namespace argparse {
namespace details { // namespace for helper methods
template <typename... Ts> struct is_container_helper {};
template <typename T, typename _ = void>
template <typename T, typename = void>
struct is_container : std::false_type {};
template <> struct is_container<std::string> : 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>> : std::true_type {};
struct is_container<T, std::void_t<typename T::value_type,
decltype(std::declval<T>().begin()),
decltype(std::declval<T>().end()),
decltype(std::declval<T>().size())>>
: std::true_type {};
template <typename T>
static constexpr bool is_container_v = is_container<T>::value;
template <typename T, typename _ = void>
template <typename T, typename = void>
struct is_streamable : std::false_type {};
template <typename T>
struct is_streamable<
T, std::conditional_t<
false, decltype(std::declval<std::ostream>() << std::declval<T>()),
void>> : std::true_type {};
T, std::void_t<decltype(std::declval<std::ostream>() << std::declval<T>())>>
: std::true_type {};
template <typename T>
static constexpr bool is_streamable_v = is_streamable<T>::value;