以静态大小的数组作为参数的通用 lambda
Generic lambdas with statically sized arrays as arguments
以下通用（多态）lambda 是否合法 C++14？
auto f = [](auto x[3]) {
x[0];
x[1];
// etc.
};
GCC 和 Clang 4 接受代码，但 Visual Studio 2017 不接受。合法吗？
error C3318: 'auto [3]': an array cannot have an element type that contains 'auto'
这是非法的。
[dcl.array]/1，强调我的：
In a declaration T D where D has the form
D1 [ constant-expressionopt ] attribute-specifier-seqopt
and the type of the identifier in the declaration T D1 is “derived-declarator-type-list T”, then the type of the identifier of D is an array type; if the type of the identifier of D contains the auto type-specifier, the program is ill-formed.
以下通用（多态）lambda 是否合法 C++14？
auto f = [](auto x[3]) {
x[0];
x[1];
// etc.
};
GCC 和 Clang 4 接受代码，但 Visual Studio 2017 不接受。合法吗？
error C3318: 'auto [3]': an array cannot have an element type that contains 'auto'
这是非法的。
[dcl.array]/1，强调我的：
In a declaration T D where D has the form
D1 [ constant-expressionopt ] attribute-specifier-seqoptand the type of the identifier in the declaration
T D1is “derived-declarator-type-listT”, then the type of the identifier ofDis an array type; if the type of the identifier ofDcontains theautotype-specifier, the program is ill-formed.