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feat: check a class has from/into_toml member fn

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to support better serialization
This commit is contained in:
ToruNiina 2019-03-16 14:16:31 +09:00
parent 9b8db6a225
commit df6dcbc4ed
1 changed files with 27 additions and 0 deletions
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27
toml/traits.hpp
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@ -9,6 +9,9 @@
namespace toml
{
class value; // forward decl
namespace detail
{
@ -45,6 +48,22 @@ struct has_resize_method_impl
template<typename T> static std::false_type check(...);
};
struct has_from_toml_method_impl
{
template<typename T>
static std::true_type check(
decltype(std::declval<T>().from_toml(std::declval<::toml::value>()))*);
template<typename T>
static std::false_type check(...);
};
struct has_into_toml_method_impl
{
template<typename T>
static std::true_type check(decltype(std::declval<T>().into_toml())*);
template<typename T>
static std::false_type check(...);
};
/// Intel C++ compiler can not use decltype in parent class declaration, here
/// is a hack to work around it. https://stackoverflow.com/a/23953090/4692076
#ifdef __INTEL_COMPILER
@ -62,6 +81,14 @@ struct has_mapped_type : decltype(has_mapped_type_impl::check<T>(nullptr)){};
template<typename T>
struct has_resize_method : decltype(has_resize_method_impl::check<T>(nullptr)){};
template<typename T>
struct has_from_toml_method
: decltype(has_from_toml_method_impl::check<T>(nullptr)){};
template<typename T>
struct has_into_toml_method
: decltype(has_into_toml_method_impl::check<T>(nullptr)){};
#ifdef __INTEL_COMPILER
#undef decltype(...)
#endif