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PO
primarykey
Id
12625334
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2012-09-27T15:53:22.490
FavoriteCount
0
LastActivityDate
2013-09-16T09:52:52.057
LastEditDate
2013-09-16T09:52:52.057
LastEditorUserId
1617269
OwnerUserId
1617269
ParentId
12624957
PostTypeId
2
Score
9
ViewCount
0
LastEditorDisplayName
text
Body
The template <code>template< bool B, class T = void > struct enable_if</code> is specialized so that it only has a <code>typedef type</code> when the condition B is <code>true</code>. Your compiler is correct. There is no typedef for <code>type</code> in <code>struct std::enable_if<false, void></code>. There is only a typedef in <code>struct std::enable_if<true, void></code>. For more info look <a href="http://en.cppreference.com/w/cpp/types/enable_if" rel="nofollow noreferrer">here</a>. So to fix your problem you need to make sure that the <code>enable_if</code> which has a B that evaluates to <code>false</code> never gets compiled. You can achieve this with the help of <a href="http://en.wikipedia.org/wiki/Substitution_failure_is_not_an_error" rel="nofollow noreferrer">SFINAE</a> by making <code>my_memcpy</code> a function template. The compiler will then not report an error when failing to compile the function template where B evaluates to <code>false</code> and will successfully compile and use the function where B evaluates to <code>true</code>. <pre><code>#include <iostream> #include <type_traits> using namespace std; struct is_64_bit { static const bool value = sizeof(void*) == 8; }; template<typename T> typename enable_if<is_64_bit::value, T>::type my_memcpy(T* target, const T* source, size_t n) { cout << "64 bit memcpy" << endl; } template<typename T> typename enable_if<!is_64_bit::value, T>::type my_memcpy(T* target, const T* source, size_t n) { cout << "32 bit memcpy" << endl; } </code></pre>
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1. This table or related slice is empty.
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1. POc++11 enable_if error
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1. PTAnswer
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1. UScyon
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1. UScyon
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1. POc++11 enable_if error
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1. COThanks cyon. It's solved now. Also I have a better understanding of this subject. :)
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 USuser1274605

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