[問題] class中的static
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遇到的問題： (題意請描述清楚)
是這樣的~有一個class長這樣
class YourClass
{
public:
YourClass(int data);
YourClass();
void set (int data);
int get();
static int calculate();
private:
int data;
static int sum;
};
其中static int calculate()會修改static int sum的值並回傳結果
int YourClass::calculate()
{
sum = 100;
return sum;
}
不過再編譯會出現
class.cpp:(.text+0x8a): undefined reference to `YourClass::sum'
class.cpp:(.text+0x96): undefined reference to `YourClass::sum'
collect2: ld returned 1 exit status
請問這種錯誤的原因和要如何解決?
補充說明：
平台是
x86_64-suse-linux
gcc version 4.3.2 [gcc-4_3-branch revision 141291] (SUSE Linux)
語言
C++
請各位幫幫我~感恩
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