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feat: use push_back instead of resize

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ToruNiina 2020-03-27 18:06:26 +09:00
parent e2790c9e7b
commit 95c3b5f538
1 changed files with 42 additions and 19 deletions
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55
toml/get.hpp
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@ -198,23 +198,23 @@ get(const basic_value<C, M, V>& v)
// ============================================================================
// forward declaration to use this recursively. ignore this and go ahead.
// array-like type with resize(N) method
// array-like type with push_back(value) method
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
detail::enable_if_t<detail::conjunction<
detail::is_container<T>, // T is container
detail::has_resize_method<T>, // T::resize(N) works
detail::is_container<T>, // T is a container
detail::has_push_back_method<T>, // T::push_back(value) works
detail::negation< // but not toml::array
detail::is_exact_toml_type<T, basic_value<C, M, V>>>
>::value, T>
get(const basic_value<C, M, V>&);
// array-like type with resize(N) method
// array-like type without push_back(value) method
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
detail::enable_if_t<detail::conjunction<
detail::is_container<T>, // T is container
detail::negation<detail::has_resize_method<T>>, // no T::resize() exists
detail::is_container<T>, // T is a container
detail::negation<detail::has_push_back_method<T>>, // w/o push_back(...)
detail::negation< // not toml::array
detail::is_exact_toml_type<T, basic_value<C, M, V>>>
>::value, T>
@ -274,31 +274,54 @@ get(const basic_value<C, M, V>&);
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
detail::enable_if_t<detail::conjunction<
detail::is_container<T>, // T is container
detail::has_resize_method<T>, // T::resize(N) works
detail::is_container<T>, // T is a container
detail::has_push_back_method<T>, // container.push_back(elem) works
detail::negation< // but not toml::array
detail::is_exact_toml_type<T, basic_value<C, M, V>>>
>::value, T>
get(const basic_value<C, M, V>& v)
{
using value_type = typename T::value_type;
const auto& ar = v.as_array();
const auto& ary = v.as_array();
T container;
container.resize(ar.size());
std::transform(ar.cbegin(), ar.cend(), container.begin(),
[](const value& x){return ::toml::get<value_type>(x);});
try_reserve(container, ary.size());
for(const auto& elem : ary)
{
container.push_back(get<value_type>(elem));
}
return container;
}
// ============================================================================
// array-like types; but does not have resize(); most likely std::array.
// std::forward_list does not have push_back, insert, or emplace.
// It has insert_after, emplace_after, push_front.
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
detail::enable_if_t<detail::is_std_forward_list<T>::value, T>
get(const basic_value<C, M, V>& v)
{
using value_type = typename T::value_type;
T container;
for(const auto& elem : v.as_array())
{
container.push_front(get<value_type>(elem));
}
container.reverse();
return container;
}
// ============================================================================
// array-like types, without push_back(). most likely [std|boost]::array.
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
detail::enable_if_t<detail::conjunction<
detail::is_container<T>, // T is container
detail::negation<detail::has_resize_method<T>>, // no T::resize() exists
detail::negation< // but not toml::array
detail::is_container<T>, // T is a container
detail::negation<detail::has_push_back_method<T>>, // w/o push_back
detail::negation< // T is not toml::array
detail::is_exact_toml_type<T, basic_value<C, M, V>>>
>::value, T>
get(const basic_value<C, M, V>& v)