https://llvm.org/bugs/show_bug.cgi?id=30357
Bug ID: 30357
Summary: Unexpected compile time error with vector<bool>
Product: libc++
Version: 3.8
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: billy.jasinie...@hpe.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Classification: Unclassified
An test case (that is an excerpt from a standard validation test) gets an error
when compiled with both g++ and clang, but only with headers from libc++. When
the same test case is compiled using gnu headers, the test compiles cleanly.
The test case:
#include <vector>
struct alloc : std::allocator<bool> {};
int main(void)
{
std::vector<bool> v1;
std::vector<bool, alloc>::reference r01 = v1[0];
}
With clang:
$ clang -c t.cpp -std=c++11 -Ic:/downloads/libcxx-3.8.1.src/include
t265.cpp:6:45: error: no viable conversion from '__bit_reference<vector<[...],
std::__1::allocator<bool>>>' to
'__bit_reference<vector<[...], alloc>>'
std::vector<bool, alloc>::reference r01 = v1[0];
^ ~~~~~
c:/downloads/libcxx-3.8.1.src/include/__bit_reference:35:7: note: candidate
constructor (the implicit copy constructor) not viable: no known
conversion from 'reference' (aka '__bit_reference<std::__1::vector<bool,
std::__1::allocator<bool> > >') to 'const
std::__1::__bit_reference<std::__1::vector<bool, alloc>, true> &' for 1st
argument
class __bit_reference
^
c:/downloads/libcxx-3.8.1.src/include/__bit_reference:51:31: note: candidate
function
_LIBCPP_INLINE_VISIBILITY operator bool() const _NOEXCEPT
^
1 error generated.
With g++:
$ g++ -c t.cpp -std=c++11 -Ic:/downloads/libcxx-3.8.1.src/include
t265.cpp: In function ‘int main()’:
t265.cpp:6:55: error: conversion from ‘std::__1::vector<bool>::reference {aka
std::__1::__bit_reference<std::__1::vector<bool>, true>}’ to non-scalar type
‘std::__1::vector<bool, alloc>::reference {aka
std::__1::__bit_reference<std::__1::vector<bool, alloc>, true>}’ requested
std::vector<bool, alloc>::reference r01 = v1[0];
The test case also compiles cleanly when headers from Dinkumware are used.
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