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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - constexpr static data member template cause an error: static data member 'v' already has an initializer"
href="https://bugs.llvm.org/show_bug.cgi?id=49410">49410</a>
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<th>Summary</th>
<td>constexpr static data member template cause an error: static data member 'v' already has an initializer
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>11.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++14
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>danny321974345@gmail.com
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>When compile the constexpr variable template below with option -std=c++14
struct A {
template <typename T>
static constexpr T v{};
};
template <typename T>
constexpr T A::v;
int main()
{
auto ptr1 = &A::v<int>;
auto ptr2 = &A::v<int>; // no error if remove this line
}
generates the error below:
clang_cxx14.cpp:3:25: error: static data member 'v' already has an initializer
static constexpr T v{};
^
clang_cxx14.cpp:10:21: note: in instantiation of static data member 'A::v<int>'
requested here
auto ptr1 = &A::v<int>;
^
clang_cxx14.cpp:3:25: note: previous initialization is here
static constexpr T v{};
^
1 error generated.
No error in -std=c++17 or above</pre>
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