constexpr Initializer list of string views
I'm trying to make a constexpr initializer list of some string constants. I think this should be possible in C++17, but I can't get it to compile in MSVC.
#include <string_view>
using namespace std::literals::string_view_literals;
const constexpr std::initializer_list<std::string_view> some_strings{
"asdf"sv
};
This gives the following error message:
error C2131: expression did not evaluate to a constant
note: failure was caused by non-constant arguments or reference to a non-constant symbol
note: see usage of '$S1'
I can't figure out which part would be non-constexpr:
- std::string_view's operator"" is constexpr
- std::initializer_list's constructor is constexpr as well
Any ideas? Is this possibly just a bug in visual studio? What is '$S1' referenced in the error message?
EDIT: Visual Studio 15.8.9
visual-c++ c++17 constexpr initializer-list
asked Nov 12 '18 at 8:34
leecbakerleecbaker
1,75422639
add a comment |
I'm trying to make a constexpr initializer list of some string constants. I think this should be possible in C++17, but I can't get it to compile in MSVC.
#include <string_view>
using namespace std::literals::string_view_literals;
const constexpr std::initializer_list<std::string_view> some_strings{
"asdf"sv
};
This gives the following error message:
error C2131: expression did not evaluate to a constant
note: failure was caused by non-constant arguments or reference to a non-constant symbol
note: see usage of '$S1'
I can't figure out which part would be non-constexpr:
- std::string_view's operator"" is constexpr
- std::initializer_list's constructor is constexpr as well
Any ideas? Is this possibly just a bug in visual studio? What is '$S1' referenced in the error message?
EDIT: Visual Studio 15.8.9
visual-c++ c++17 constexpr initializer-list
asked Nov 12 '18 at 8:34
leecbakerleecbaker
1,75422639
Latest MSVC. They announced 100% conformance with the standard in 15.7, and I'm using 15.8.9.
– leecbaker
Nov 12 '18 at 8:43
add a comment |
I'm trying to make a constexpr initializer list of some string constants. I think this should be possible in C++17, but I can't get it to compile in MSVC.
#include <string_view>
using namespace std::literals::string_view_literals;
const constexpr std::initializer_list<std::string_view> some_strings{
"asdf"sv
};
This gives the following error message:
error C2131: expression did not evaluate to a constant
note: failure was caused by non-constant arguments or reference to a non-constant symbol
note: see usage of '$S1'
I can't figure out which part would be non-constexpr:
- std::string_view's operator"" is constexpr
- std::initializer_list's constructor is constexpr as well
Any ideas? Is this possibly just a bug in visual studio? What is '$S1' referenced in the error message?
EDIT: Visual Studio 15.8.9
visual-c++ c++17 constexpr initializer-list
asked Nov 12 '18 at 8:34
leecbakerleecbaker
1,75422639
I'm trying to make a constexpr initializer list of some string constants. I think this should be possible in C++17, but I can't get it to compile in MSVC.
#include <string_view>
using namespace std::literals::string_view_literals;
const constexpr std::initializer_list<std::string_view> some_strings{
"asdf"sv
};
This gives the following error message:
error C2131: expression did not evaluate to a constant
note: failure was caused by non-constant arguments or reference to a non-constant symbol
note: see usage of '$S1'
I can't figure out which part would be non-constexpr:
- std::string_view's operator"" is constexpr
- std::initializer_list's constructor is constexpr as well
Any ideas? Is this possibly just a bug in visual studio? What is '$S1' referenced in the error message?
EDIT: Visual Studio 15.8.9
visual-c++ c++17 constexpr initializer-list
visual-c++ c++17 constexpr initializer-list
asked Nov 12 '18 at 8:34
leecbakerleecbaker
1,75422639
asked Nov 12 '18 at 8:34
leecbakerleecbaker
1,75422639
edited Nov 12 '18 at 8:42
leecbaker
asked Nov 12 '18 at 8:34
leecbakerleecbaker
1,75422639
asked Nov 12 '18 at 8:34
leecbakerleecbaker
1,75422639
asked Nov 12 '18 at 8:34
leecbakerleecbaker
1,75422639
1,75422639
Latest MSVC. They announced 100% conformance with the standard in 15.7, and I'm using 15.8.9.
– leecbaker
Nov 12 '18 at 8:43
add a comment |
Latest MSVC. They announced 100% conformance with the standard in 15.7, and I'm using 15.8.9.
– leecbaker
Nov 12 '18 at 8:43
Latest MSVC. They announced 100% conformance with the standard in 15.7, and I'm using 15.8.9.
– leecbaker
Nov 12 '18 at 8:43
Latest MSVC. They announced 100% conformance with the standard in 15.7, and I'm using 15.8.9.
– leecbaker
Nov 12 '18 at 8:43
add a comment |
1 Answer
1
active
oldest
votes
It seems like a bug on older versions: https://godbolt.org/z/YICeqi
I just tried your code on v15.9.2 and it works fine.
answered Nov 23 '18 at 5:54
MacMac
1,20511540
add a comment |
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1 Answer
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1 Answer
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active
oldest
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oldest
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It seems like a bug on older versions: https://godbolt.org/z/YICeqi
I just tried your code on v15.9.2 and it works fine.
answered Nov 23 '18 at 5:54
MacMac
1,20511540
add a comment |
It seems like a bug on older versions: https://godbolt.org/z/YICeqi
I just tried your code on v15.9.2 and it works fine.
answered Nov 23 '18 at 5:54
MacMac
1,20511540
add a comment |
It seems like a bug on older versions: https://godbolt.org/z/YICeqi
I just tried your code on v15.9.2 and it works fine.
answered Nov 23 '18 at 5:54
MacMac
1,20511540
It seems like a bug on older versions: https://godbolt.org/z/YICeqi
I just tried your code on v15.9.2 and it works fine.
answered Nov 23 '18 at 5:54
MacMac
1,20511540
answered Nov 23 '18 at 5:54
MacMac
1,20511540
answered Nov 23 '18 at 5:54
MacMac
1,20511540
answered Nov 23 '18 at 5:54
MacMac
1,20511540
1,20511540
add a comment |
add a comment |
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Latest MSVC. They announced 100% conformance with the standard in 15.7, and I'm using 15.8.9.
– leecbaker
Nov 12 '18 at 8:43