[問題] C++ Template

[diskk (oi)]

請教一個問題
我有如下一段程式碼
要讓函式接收各種型態的Vector
但無法編譯
請問要如何修改
謝謝

#include <iostream>
#include <vector>
template <typename T> int vecSize(vector<T> a);

using namespace std;

int main()
{
    vector<int> vec(10,0);
    cout << vecSize(vec) << endl;
    return 0;
}

template <typename T>
int vecSize(vector<T> a)
{
        return a.size();
}


錯誤訊息如下
D:\My Dropbox\School\Digital Image Processing\fftDev\main.cpp|3|error:
template declaration of 'int vecSize'|
D:\My Dropbox\School\Digital Image Processing\fftDev\main.cpp|3|error:
'vector' was not declared in this scope|
D:\My Dropbox\School\Digital Image Processing\fftDev\main.cpp|3|error:
expected primary-expression before '>' token|
D:\My Dropbox\School\Digital Image Processing\fftDev\main.cpp|3|error: 'a'
was not declared in this scope|
D:\My Dropbox\School\Digital Image Processing\fftDev\main.cpp||In function
'int main()':|
D:\My Dropbox\School\Digital Image Processing\fftDev\main.cpp|10|error:
'vecSize' was not declared in this scope|
||=== Build finished: 5 errors, 0 warnings ===|

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◆ From: 125.232.184.24
→ akasan:你的你prototype放在using前面,他認不得vec
→ diskk:原來只有一行之差，感謝您!!
推 tomap41017:這是線上編譯嗎??
→ loveme00835:樓上的意思是? >"<
推 tomap41017:就是compiler在dropbox上嗎？
→ tomap41017:不然error msg怎麼印出來在那邊XD
推 LPH66:那個是本機資料夾而已吧 XD