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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Dereferencing an initilizer_list::begin() is not treated as a constant expression"
href="https://bugs.llvm.org/show_bug.cgi?id=42602">42602</a>
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<th>Summary</th>
<td>Dereferencing an initilizer_list::begin() is not treated as a constant expression
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</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++11
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>antoshkka@gmail.com
</td>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
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<pre>Following example does not compile in C++11 and later std modes:
#include <initializer_list>
constexpr std::initializer_list<unsigned> i_list = {10u};
unsigned test() {
constexpr unsigned v = *i_list.begin();
return v;
}
Errors:
<source>:6:24: error: constexpr variable 'v' must be initialized by a constant
expression
constexpr unsigned v = *i_list.begin();
^ ~~~~~~~~~~~~~~~
<source>:6:28: note: read of temporary is not allowed in a constant expression
outside the expression that created the temporary
constexpr unsigned v = *i_list.begin();
^
<source>:3:52: note: temporary created here
constexpr std::initializer_list<unsigned> i_list = {10u};</pre>
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