C2070 - 操作数大小非法

C2070 - illegal sizeof operand(C2070 - 操作数大小非法)

问题描述

以下代码对我来说很好:

The following code looks fine to me:

    #include <stdio.h>

    template <typename T>
    struct A
    {
        static float m_kA[];
    };

    template <typename T>
    float A<T>::m_kA[] = {1.0f, 2.0f, 3.0f};

    int main()
    {
        printf("%d
", 
            sizeof(A<unsigned int>::m_kA) /
            sizeof(A<unsigned int>::m_kA[0]));
        return 0;
    }

但是当我用 VC9 编译时出现以下错误

But when i compile with VC9 i get the following error

error C2070: 'float []': illegal sizeof operand

我希望这段代码能够编译.我错过了什么吗?有谁知道解决这种奇怪行为的方法(请注意，没有模板的完全相同的东西可以正常编译并输出 3).

I would expect this code to compile. Am i missing something? Does anyone know a way to fix this strange behavior (note that the exact same thing without the template compiles fine and outputs 3).

请注意，删除模板不是一个选项，我制作这个示例是为了重现我在代码中遇到的问题，我需要包含数组的类型作为模板.

Note that removing the template is not an option, i made this example to reproduce a problem that i'm having in a code where i need the type containing the array to be a template.

谢谢

推荐答案

http://ideone.com/3ssVi

它用 G++ 编译得很好.

it compiles fine with G++.

据我所知，它可能与此错误有关:

As far as i can see it can be related to this bug:

http://connect.microsoft.com/VisualStudio/feedback/details/759407/can-not-get-size-of-static-array-defined-in-class-template

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