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get_if may not be called if there is more than one match

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Hans Dembinski
2019-06-02 21:35:27 +02:00
parent de37af2a94
commit 4e7febfa2c
1 changed files with 2 additions and 0 deletions
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2
include/boost/histogram/detail/variant.hpp
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@@ -130,12 +130,14 @@ public:
template <class T>
T* get_if() noexcept {
static_assert(mp11::mp_count<variant, T>::value <= 1, "no unique match for T");
constexpr auto i = mp11::mp_find<variant, T>{};
return i == index_ ? &ref<T>() : nullptr;
}
template <class T>
const T* get_if() const noexcept {
static_assert(mp11::mp_count<variant, T>::value <= 1, "no unique match for T");
constexpr auto i = mp11::mp_find<variant, T>{};
return i == index_ ? &ref<T>() : nullptr;
}