template<typename T>
struct TFSS
{
    static const char* FMT;
};
template<typename T>
const char* TFSS<T>::FMT = "%s";

template<>
struct TFSS<char>
{
    static const char* FMT;
};
template<>
const char* TFSS<char>::FMT = "%hu";

template<>
struct TFSS<unsigned char>
{
    static const char* FMT;
};
template<>
const char* TFSS<unsigned char>::FMT = "%hd";

代码编译出错

error C2998: “const char *TFSS<char>::FMT”: 不能是模板定义
error C2998: “const char *TFSS<unsigned char>::FMT”: 不能是模板定义

修改成如下代码

template<typename T>
struct TFSS
{
    static const char* FMT;
};
template<typename T>
const char* TFSS<T>::FMT = "%s";

template<>
struct TFSS<char>
{
    static const char* FMT;
};
const char* TFSS<char>::FMT = "%hu";

template<>
struct TFSS<unsigned char>
{
    static const char* FMT;
};
const char* TFSS<unsigned char>::FMT = "%hd";

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