Function-scope name in generic lambda trailing return type won't compile (MSVC)
0
Given the following code snippet, case 1, 2, 3, and 4 compile in Visual Studio 2017 (/std:c++14), but case 5 doesn't. What's going on?
int i;
auto case1 = (auto) -> decltype(i, void()) {};
int main() {
int j;
auto case2 = (int) -> decltype(j, void()) {};
auto case3 = [j](auto) -> decltype(j, void()) {};
auto case4 = (auto) -> decltype(i, void()) {};
auto case5 = (auto) -> decltype(j, void()) {};
case1(int()); // OK
case2(int()); // OK
case3(int()); // OK
case4(int()); // OK
case5(int()); // Error: message below
return 0;
}
Here's the compiler's output.
main.cpp(15): error C2672: 'operator __surrogate_func': no matching overloaded function found
main.cpp(15): error C2893: Failed to specialize function template 'void main::<lambda_1>::operator ()(_T1) const'
main.cpp(15): note: With the following template arguments: '_T1=int'
visual-c++ c++14 trailing-return-type generic-lambda
asked Nov 19 '18 at 19:35
mkobierskimkobierski
293
add a comment |
0
Given the following code snippet, case 1, 2, 3, and 4 compile in Visual Studio 2017 (/std:c++14), but case 5 doesn't. What's going on?
int i;
auto case1 = (auto) -> decltype(i, void()) {};
int main() {
int j;
auto case2 = (int) -> decltype(j, void()) {};
auto case3 = [j](auto) -> decltype(j, void()) {};
auto case4 = (auto) -> decltype(i, void()) {};
auto case5 = (auto) -> decltype(j, void()) {};
case1(int()); // OK
case2(int()); // OK
case3(int()); // OK
case4(int()); // OK
case5(int()); // Error: message below
return 0;
}
Here's the compiler's output.
main.cpp(15): error C2672: 'operator __surrogate_func': no matching overloaded function found
main.cpp(15): error C2893: Failed to specialize function template 'void main::<lambda_1>::operator ()(_T1) const'
main.cpp(15): note: With the following template arguments: '_T1=int'
visual-c++ c++14 trailing-return-type generic-lambda
asked Nov 19 '18 at 19:35
mkobierskimkobierski
293
4
A bug? In MSVC? Unpossible!
– n.m.
Nov 19 '18 at 19:47
add a comment |
0
0
0
Given the following code snippet, case 1, 2, 3, and 4 compile in Visual Studio 2017 (/std:c++14), but case 5 doesn't. What's going on?
int i;
auto case1 = (auto) -> decltype(i, void()) {};
int main() {
int j;
auto case2 = (int) -> decltype(j, void()) {};
auto case3 = [j](auto) -> decltype(j, void()) {};
auto case4 = (auto) -> decltype(i, void()) {};
auto case5 = (auto) -> decltype(j, void()) {};
case1(int()); // OK
case2(int()); // OK
case3(int()); // OK
case4(int()); // OK
case5(int()); // Error: message below
return 0;
}
Here's the compiler's output.
main.cpp(15): error C2672: 'operator __surrogate_func': no matching overloaded function found
main.cpp(15): error C2893: Failed to specialize function template 'void main::<lambda_1>::operator ()(_T1) const'
main.cpp(15): note: With the following template arguments: '_T1=int'
visual-c++ c++14 trailing-return-type generic-lambda
asked Nov 19 '18 at 19:35
mkobierskimkobierski
293
Given the following code snippet, case 1, 2, 3, and 4 compile in Visual Studio 2017 (/std:c++14), but case 5 doesn't. What's going on?
int i;
auto case1 = (auto) -> decltype(i, void()) {};
int main() {
int j;
auto case2 = (int) -> decltype(j, void()) {};
auto case3 = [j](auto) -> decltype(j, void()) {};
auto case4 = (auto) -> decltype(i, void()) {};
auto case5 = (auto) -> decltype(j, void()) {};
case1(int()); // OK
case2(int()); // OK
case3(int()); // OK
case4(int()); // OK
case5(int()); // Error: message below
return 0;
}
Here's the compiler's output.
main.cpp(15): error C2672: 'operator __surrogate_func': no matching overloaded function found
main.cpp(15): error C2893: Failed to specialize function template 'void main::<lambda_1>::operator ()(_T1) const'
main.cpp(15): note: With the following template arguments: '_T1=int'
visual-c++ c++14 trailing-return-type generic-lambda
visual-c++ c++14 trailing-return-type generic-lambda
asked Nov 19 '18 at 19:35
mkobierskimkobierski
293
asked Nov 19 '18 at 19:35
mkobierskimkobierski
293
edited Nov 19 '18 at 19:41
mkobierski
asked Nov 19 '18 at 19:35
mkobierskimkobierski
293
asked Nov 19 '18 at 19:35
mkobierskimkobierski
293
asked Nov 19 '18 at 19:35
mkobierskimkobierski
293
293
4
A bug? In MSVC? Unpossible!
– n.m.
Nov 19 '18 at 19:47
add a comment |
4
A bug? In MSVC? Unpossible!
– n.m.
Nov 19 '18 at 19:47
4
4
A bug? In MSVC? Unpossible!
– n.m.
Nov 19 '18 at 19:47
A bug? In MSVC? Unpossible!
– n.m.
Nov 19 '18 at 19:47
add a comment |
1 Answer
1
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0
This is a bug in MSVC. I opened a bug: Error instantiating lambda template
Fixes are prioritized by upvotes. Feel free to upvote the issue.
answered Nov 23 '18 at 5:45
MacMac
1,20511540
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
0
This is a bug in MSVC. I opened a bug: Error instantiating lambda template
Fixes are prioritized by upvotes. Feel free to upvote the issue.
answered Nov 23 '18 at 5:45
MacMac
1,20511540
add a comment |
0
This is a bug in MSVC. I opened a bug: Error instantiating lambda template
Fixes are prioritized by upvotes. Feel free to upvote the issue.
answered Nov 23 '18 at 5:45
MacMac
1,20511540
add a comment |
0
0
0
This is a bug in MSVC. I opened a bug: Error instantiating lambda template
Fixes are prioritized by upvotes. Feel free to upvote the issue.
answered Nov 23 '18 at 5:45
MacMac
1,20511540
This is a bug in MSVC. I opened a bug: Error instantiating lambda template
Fixes are prioritized by upvotes. Feel free to upvote the issue.
answered Nov 23 '18 at 5:45
MacMac
1,20511540
answered Nov 23 '18 at 5:45
MacMac
1,20511540
answered Nov 23 '18 at 5:45
MacMac
1,20511540
answered Nov 23 '18 at 5:45
MacMac
1,20511540
1,20511540
add a comment |
add a comment |
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4
A bug? In MSVC? Unpossible!
– n.m.
Nov 19 '18 at 19:47