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add a switch to enable implicit conversions (defaults to true)

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wrap implicit conversions tests around the JSON_USE_IMPLICIT_CONVERSIONS
macro
This commit is contained in:
Théo DELRIEU 2020-07-16 11:11:35 +02:00
parent 2cd10a7405
commit 74b446f5fd
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15 changed files with 151 additions and 64 deletions
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10
include/nlohmann/detail/meta/type_traits.hpp
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@ -94,6 +94,16 @@ using get_template_function = decltype(std::declval<T>().template get<U>());
template<typename BasicJsonType, typename T, typename = void>
struct has_from_json : std::false_type {};
// trait checking if j.get<T> is valid
// use this trait instead of std::is_constructible or std::is_convertible,
// both rely on, or make use of implicit conversions, and thus fail when T
// has several constructors/operator= (see https://github.com/nlohmann/json/issues/958)
template <typename BasicJsonType, typename T>
struct is_getable
{
static constexpr bool value = is_detected<get_template_function, const BasicJsonType&, T>::value;
};
template<typename BasicJsonType, typename T>
struct has_from_json < BasicJsonType, T,
enable_if_t < !is_basic_json<T>::value >>