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Constrain Argument constructor better

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Without this change, std::allocator can construct Argument
This commit is contained in:
Zhihao Yuan 2019-11-17 18:55:52 -06:00
parent 556d935491
commit 4c5ded8c84
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GPG Key ID: A2E474BDAA37E11C
1 changed files with 6 additions and 2 deletions
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8
include/argparse.hpp
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@ -69,6 +69,11 @@ struct is_container<
template <typename T> template <typename T>
static constexpr bool is_container_v = is_container<T>::value; static constexpr bool is_container_v = is_container<T>::value;
template <typename T>
struct is_string_like
: std::conjunction<std::is_constructible<std::string, T>,
std::is_convertible<T, std::string_view>> {};
template <typename T> template <typename T>
using enable_if_container = std::enable_if_t<is_container_v<T>, T>; using enable_if_container = std::enable_if_t<is_container_v<T>, T>;
@ -115,8 +120,7 @@ public:
template <typename... Args, template <typename... Args,
std::enable_if_t< std::enable_if_t<
std::conjunction_v<std::is_constructible<std::string, Args>...>, std::conjunction_v<details::is_string_like<Args>...>, int> = 0>
int> = 0>
explicit Argument(Args &&... args) explicit Argument(Args &&... args)
: Argument({std::string(std::forward<Args>(args))...}, : Argument({std::string(std::forward<Args>(args))...},
std::make_index_sequence<sizeof...(Args)>{}) {} std::make_index_sequence<sizeof...(Args)>{}) {}