[英]Passing std::initializer_list as a non-type template argument
I have a problem with the following code: 我的以下代码有问题:
#include <deque>
#include <initializer_list>
#include <string>
struct EnumItem
{
inline operator int() const {
return id;
}
std::string name;
int id;
};
template <const std::initializer_list<EnumItem>& items>
class Enum
{
public:
private:
static const std::deque<EnumItem> _items;
};
template <const std::initializer_list<EnumItem>& items>
const std::deque<EnumItem> Enum<items>::_items{ items };
int main()
{
Enum<{{"0", 0}}> test;
return 0;
}
It doesn't compile, throws numerous syntax errors about my test
instantiation: 它不编译,引发关于我的test
实例的许多语法错误:
2>error C2059: syntax error : '{'
2>error C2143: syntax error : missing ';' before '{'
2>error C2143: syntax error : missing '>' before ';'
2>error C2976: 'Enum' : too few template arguments
2>: see declaration of 'Enum'
2>error C2447: '{' : missing function header (old-style formal list?)
2>error C2059: syntax error : '>'
What am I doing wrong and how to do it right? 我做错了什么,怎么做对了?
initializer_list
is not a type which can be used with non-type template parameters. initializer_list
不是可与非类型模板参数一起使用的类型。 In C++14, these are restricted to enums, integers, pointers of all kinds, lvalue references, and nullptr_t
. 在C ++ 14中,这些限制为枚举,整数,各种指针,左值引用和nullptr_t
。
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