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std::tuple_element_t<> used without being defined #247

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mpark opened this issue Dec 13, 2013 · 1 comment
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std::tuple_element_t<> used without being defined #247

mpark opened this issue Dec 13, 2013 · 1 comment

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@mpark
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mpark commented Dec 13, 2013

In the current working draft, in section 20.3.4.

template<size_t I, class T1, class T2>
constexpr tuple_element_t<I, std::pair<T1, T2>> &get(pair<T1, T2>&) noexcept;

The return type should be:

template<size_t I, class T1, class T2>
constexpr typename tuple_element<I, std::pair<T1, T2>>::type &get(pair<T1, T2>&) noexcept;

Unless std::tuple_element_t<> will be added similar to the utilities in the <type_traits> header, in which case the definition should be added.
@potswa
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potswa commented Dec 13, 2013

It appears to have been substituted unintentionally in 59d041e along with the new <type_traits> aliases.

@jwakely jwakely mentioned this issue Jan 21, 2014
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@potswa @mpark