如何默认初始化静态类模板变量
[英]How can I default initialize static class template variables
问题描述
In the following code 
在下面的代码中
#include <iostream>
#include <string>
#include <type_traits>
template<class T, typename = std::enable_if<std::is_default_constructible<T>::value>>
struct E {
static T var;
};
int main() {
std::cout << E<std::string>::var << std::endl;
}
How can I have E<T>::var default constructed for each template instantiation of E ? 如何为E每个模板实例构造E<T>::var默认值？ Currently I receiev linker error 目前我收到链接器错误
/home/tE1MjB/ccEXSZtn.o: In function `main':
prog.cpp:(.text.startup+0x12): undefined reference to `E<std::string, std::enable_if<true, void> >::var'
collect2: error: ld returned 1 exit status
1 个解决方案
解决方案1
2 已采纳 2016-11-09 19:15:45
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