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reinterpret_cast from rvalue to rvalue reference
What are the differences between a pointer variable and a reference variable in C++?When should static_cast, dynamic_cast, const_cast and reinterpret_cast be used?What are rvalues, lvalues, xvalues, glvalues, and prvalues?Why is this program erroneously rejected by three C++ compilers?GCC accepts `constexpr struct {} s;` but Clang rejects it. Who is correct?Lambda returning itself: is this legal?`extern` declarations and following defintions of class template instances with and without parameter listsWhy do (only) some compilers use the same address for identical string literals?Declaring defaulted assignment operator as constexpr: which compiler is right?Using incomplete type in a member function of a class template
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Just a simple does it compile test.
gcc accepts the following while clang and msvc reject it: https://godbolt.org/z/DlUasL
float test()
{
return reinterpret_cast<float&&>(0x7F800000);
}
Which one is right according to the standard?
c++ standards-compliance
asked 9 hours ago
Trass3rTrass3r
3,1171732
add a comment |
Just a simple does it compile test.
gcc accepts the following while clang and msvc reject it: https://godbolt.org/z/DlUasL
float test()
{
return reinterpret_cast<float&&>(0x7F800000);
}
Which one is right according to the standard?
c++ standards-compliance
asked 9 hours ago
Trass3rTrass3r
3,1171732
2
Pretty sure that's going to be UB in any case as there is nofloatto alias here.
– Quentin
9 hours ago
Yeah it's derived from the more "usual"reinterpret_cast<float&>(variable)pattern.
– Trass3r
9 hours ago
add a comment |
Just a simple does it compile test.
gcc accepts the following while clang and msvc reject it: https://godbolt.org/z/DlUasL
float test()
{
return reinterpret_cast<float&&>(0x7F800000);
}
Which one is right according to the standard?
c++ standards-compliance
asked 9 hours ago
Trass3rTrass3r
3,1171732
Just a simple does it compile test.
gcc accepts the following while clang and msvc reject it: https://godbolt.org/z/DlUasL
float test()
{
return reinterpret_cast<float&&>(0x7F800000);
}
Which one is right according to the standard?
c++ standards-compliance
c++ standards-compliance
asked 9 hours ago
Trass3rTrass3r
3,1171732
asked 9 hours ago
Trass3rTrass3r
3,1171732
asked 9 hours ago
Trass3rTrass3r
3,1171732
asked 9 hours ago
Trass3rTrass3r
3,1171732
asked 9 hours ago
Trass3rTrass3r
3,1171732
3,1171732
2
Pretty sure that's going to be UB in any case as there is nofloatto alias here.
– Quentin
9 hours ago
Yeah it's derived from the more "usual"reinterpret_cast<float&>(variable)pattern.
– Trass3r
9 hours ago
add a comment |
2
Pretty sure that's going to be UB in any case as there is nofloatto alias here.
– Quentin
9 hours ago
Yeah it's derived from the more "usual"reinterpret_cast<float&>(variable)pattern.
– Trass3r
9 hours ago
2
2
Pretty sure that's going to be UB in any case as there is no
float to alias here.– Quentin
9 hours ago
Pretty sure that's going to be UB in any case as there is no
float to alias here.– Quentin
9 hours ago
Yeah it's derived from the more "usual"
reinterpret_cast<float&>(variable) pattern.– Trass3r
9 hours ago
Yeah it's derived from the more "usual"
reinterpret_cast<float&>(variable) pattern.– Trass3r
9 hours ago
add a comment |
1 Answer
1
active
oldest
votes
The conversion this reinterpret_cast expression seeks to perform is not among the list of conversions [expr.reinterpret.cast] that a reinterpret_cast can perform [expr.reinterpret.cast]/1. 0x7F800000 is a literal of integral type. The only conversion reinterpret_cast could perform that converts from a value of integral type to some other type is that of turning such a value into a pointer type [expr.reinterpret.cast]/5. float&& is a reference type, not a pointer type. The only conversion reinterpret_cast can perform that converts to a reference type is that of converting a glvalue expression [expr.reinterpret.cast]/11. 0x7F800000 is not a glvalue. Thus, this code is ill-formed. The fact that GCC would accept this is quite surprising to me and, I would say, definitely a bug that should be reported…
answered 9 hours ago
Michael KenzelMichael Kenzel
10.6k11926
I thought so, thanks. gcc.gnu.org/bugzilla/show_bug.cgi?id=86633
– Trass3r
9 hours ago
add a comment |
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1 Answer
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1 Answer
1
active
oldest
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active
oldest
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active
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votes
The conversion this reinterpret_cast expression seeks to perform is not among the list of conversions [expr.reinterpret.cast] that a reinterpret_cast can perform [expr.reinterpret.cast]/1. 0x7F800000 is a literal of integral type. The only conversion reinterpret_cast could perform that converts from a value of integral type to some other type is that of turning such a value into a pointer type [expr.reinterpret.cast]/5. float&& is a reference type, not a pointer type. The only conversion reinterpret_cast can perform that converts to a reference type is that of converting a glvalue expression [expr.reinterpret.cast]/11. 0x7F800000 is not a glvalue. Thus, this code is ill-formed. The fact that GCC would accept this is quite surprising to me and, I would say, definitely a bug that should be reported…
answered 9 hours ago
Michael KenzelMichael Kenzel
10.6k11926
I thought so, thanks. gcc.gnu.org/bugzilla/show_bug.cgi?id=86633
– Trass3r
9 hours ago
add a comment |
The conversion this reinterpret_cast expression seeks to perform is not among the list of conversions [expr.reinterpret.cast] that a reinterpret_cast can perform [expr.reinterpret.cast]/1. 0x7F800000 is a literal of integral type. The only conversion reinterpret_cast could perform that converts from a value of integral type to some other type is that of turning such a value into a pointer type [expr.reinterpret.cast]/5. float&& is a reference type, not a pointer type. The only conversion reinterpret_cast can perform that converts to a reference type is that of converting a glvalue expression [expr.reinterpret.cast]/11. 0x7F800000 is not a glvalue. Thus, this code is ill-formed. The fact that GCC would accept this is quite surprising to me and, I would say, definitely a bug that should be reported…
answered 9 hours ago
Michael KenzelMichael Kenzel
10.6k11926
I thought so, thanks. gcc.gnu.org/bugzilla/show_bug.cgi?id=86633
– Trass3r
9 hours ago
add a comment |
The conversion this reinterpret_cast expression seeks to perform is not among the list of conversions [expr.reinterpret.cast] that a reinterpret_cast can perform [expr.reinterpret.cast]/1. 0x7F800000 is a literal of integral type. The only conversion reinterpret_cast could perform that converts from a value of integral type to some other type is that of turning such a value into a pointer type [expr.reinterpret.cast]/5. float&& is a reference type, not a pointer type. The only conversion reinterpret_cast can perform that converts to a reference type is that of converting a glvalue expression [expr.reinterpret.cast]/11. 0x7F800000 is not a glvalue. Thus, this code is ill-formed. The fact that GCC would accept this is quite surprising to me and, I would say, definitely a bug that should be reported…
answered 9 hours ago
Michael KenzelMichael Kenzel
10.6k11926
The conversion this reinterpret_cast expression seeks to perform is not among the list of conversions [expr.reinterpret.cast] that a reinterpret_cast can perform [expr.reinterpret.cast]/1. 0x7F800000 is a literal of integral type. The only conversion reinterpret_cast could perform that converts from a value of integral type to some other type is that of turning such a value into a pointer type [expr.reinterpret.cast]/5. float&& is a reference type, not a pointer type. The only conversion reinterpret_cast can perform that converts to a reference type is that of converting a glvalue expression [expr.reinterpret.cast]/11. 0x7F800000 is not a glvalue. Thus, this code is ill-formed. The fact that GCC would accept this is quite surprising to me and, I would say, definitely a bug that should be reported…
answered 9 hours ago
Michael KenzelMichael Kenzel
10.6k11926
edited 9 hours ago
answered 9 hours ago
Michael KenzelMichael Kenzel
10.6k11926
answered 9 hours ago
Michael KenzelMichael Kenzel
10.6k11926
answered 9 hours ago
Michael KenzelMichael Kenzel
10.6k11926
10.6k11926
I thought so, thanks. gcc.gnu.org/bugzilla/show_bug.cgi?id=86633
– Trass3r
9 hours ago
add a comment |
I thought so, thanks. gcc.gnu.org/bugzilla/show_bug.cgi?id=86633
– Trass3r
9 hours ago
I thought so, thanks. gcc.gnu.org/bugzilla/show_bug.cgi?id=86633
– Trass3r
9 hours ago
I thought so, thanks. gcc.gnu.org/bugzilla/show_bug.cgi?id=86633
– Trass3r
9 hours ago
add a comment |
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2
Pretty sure that's going to be UB in any case as there is no
floatto alias here.– Quentin
9 hours ago
Yeah it's derived from the more "usual"
reinterpret_cast<float&>(variable)pattern.– Trass3r
9 hours ago