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simplify SFINAE expressions in toml::get

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ToruNiina 2018-05-05 11:42:11 +09:00
parent b6f53cae7a
commit e54deacf1a
1 changed files with 40 additions and 24 deletions
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64
toml/get.hpp
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@ -6,51 +6,67 @@
namespace toml
{
template<typename T, toml::value_t vT = toml::detail::check_type<T>(),
typename std::enable_if<(vT != toml::value_t::Unknown &&
vT != value_t::Empty), std::nullptr_t>::type = nullptr>
inline T get(const toml::value& v)
template<typename T, typename std::enable_if<
detail::is_exact_toml_type<T>::value, std::nullptr_t>::type = nullptr>
inline T& get(value& v)
{
return static_cast<T>(v.cast<vT>());
constexpr value_t kind = detail::check_type<T>();
return v.cast<kind>();
}
template<typename T, typename std::enable_if<
detail::is_exact_toml_type<T>::value, std::nullptr_t>::type = nullptr>
inline T const& get(const value& v)
{
constexpr value_t kind = detail::check_type<T>();
return v.cast<kind>();
}
template<typename T, typename std::enable_if<detail::conjunction<
detail::negation<detail::is_exact_toml_type<T>>,
detail::negation<std::is_same<T, bool>>, std::is_integral<T>
>::value, std::nullptr_t>::type = nullptr>
inline T get(const value& v)
{
return static_cast<T>(v.cast<value_t::Integer>());
}
template<typename T, typename std::enable_if<detail::conjunction<
detail::negation<detail::is_exact_toml_type<T>>, std::is_floating_point<T>
>::value, std::nullptr_t>::type = nullptr>
inline T get(const value& v)
{
return static_cast<T>(v.cast<value_t::Float>());
}
// array-like type
template<typename T, toml::value_t vT = toml::detail::check_type<T>(),
typename std::enable_if<(vT == toml::value_t::Unknown) &&
(!toml::detail::is_map<T>::value) &&
toml::detail::is_container<T>::value, std::nullptr_t>::type = nullptr>
T get(const toml::value& v)
template<typename T, typename std::enable_if<detail::conjunction<
detail::negation<detail::is_exact_toml_type<T>>, detail::is_container<T>
>::value, std::nullptr_t>::type = nullptr>
T get(const value& v)
{
if(v.type() != value_t::Array)
throw type_error("get: value type: " + stringize(v.type()) +
std::string(" is not argument type: Array"));
const auto& ar = v.cast<value_t::Array>();
T tmp;
try
{
toml::resize(tmp, ar.size());
::toml::resize(tmp, ar.size());
}
catch(std::invalid_argument& iv)
{
throw toml::type_error("toml::get: static array size is not enough");
throw type_error("toml::get: static array: size is not enough");
}
std::transform(ar.cbegin(), ar.cend(), tmp.begin(),
[](toml::value const& elem){return get<typename T::value_type>(elem);});
[](value const& elem){return get<typename T::value_type>(elem);});
return tmp;
}
// table-like case
template<typename T, toml::value_t vT = toml::detail::check_type<T>(),
typename std::enable_if<(vT == toml::value_t::Unknown) &&
toml::detail::is_map<T>::value, std::nullptr_t>::type = nullptr>
template<typename T, typename std::enable_if<detail::conjunction<
detail::negation<detail::is_exact_toml_type<T>>, detail::is_map<T>
>::value, std::nullptr_t>::type = nullptr>
T get(const toml::value& v)
{
if(v.type() != value_t::Table)
throw type_error("get: value type: " + stringize(v.type()) +
std::string(" is not argument type: Table"));
T tmp;
const auto& tb = v.cast<value_t::Table>();
T tmp;
for(const auto& kv : tb){tmp.insert(kv);}
return tmp;
}