在Visual Studio中使用Lambda进行模板化变量错误吗? [英] Templated Variables Bug With Lambdas in Visual Studio?
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问题描述
c ++ 14 提供变量模板在 visual-studio-2017 ,但在lambda中,似乎分崩离析。例如:
c++14 provides variable templates Which work fine in visual-studio-2017, but within lambdas they seem to fall apart. For example:
template <typename T>
const auto PI = std::acos(static_cast<T>(-1));
int main() {
auto func = []() { cout << PI<float> << endl; };
func();
}
在gcc 6.3 上将输出:
3.14159
3.14159
在Visual Studio 2017上,此输出为:
On Visual Studio 2017 this outputs:
0.0
0.0
推荐答案
似乎有一个可靠的解决方法,它既适用于这种情况,也适用于相关案例。在这两种情况下,强制激活模板似乎都能在VS2017中完成:
Wierd bug, but it seems to have a reliable workaround, which works for both, this case and the related case. In both cases forcefully activating template seems to do the job in VS2017:
template <typename T>
const auto PI = std::acos(static_cast<T>(-1));
int main()
{
PI<float>; // <------ this
auto func = []() { std::cout << PI<float> << std::endl; };
func();
}
GCC 6.3例如: https://ideone.com/9UdwBT
GCC 6.3 for example: https://ideone.com/9UdwBT
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