與模板的類的構造函數的問題

Question

我想用C++和模板編寫容器類。但是，我有一個編譯錯誤，我不明白...

變量elems是私人向量，聲明是：

private: 
    vector<DataType> elems; 

的載體是一個自定義的矢量。它的構造是：

vector::vector(int init_capacity) : vect_capacity(init_capacity), vect_size(0), vect_elems(NULL){ 
    assert(init_capacity >= 0); 

    if (init_capacity > 0){ 
    vect_elems = new Object[init_capacity]; 
} 

}

的構造可以如下圖所示：

template <class DataType> 
bag<DataType>::bag(int init_capacity) : elems(init_capacity) { 
} 

此代碼返回以下錯誤：

../src/vector.h: In instantiation of ‘vector<DataType>::vector(int) [with DataType = int]’: 
../src/bag.h:33:60: required from ‘bag<DataType>::bag(int) [with DataType = int]’ 
../src/bag_test.cpp:6:17: required from here 

老實說，我不知道是什麼可能會發生。將非常感謝任何人可以指出我在正確的方向...

Answer 1

對不起，這個非常愚蠢的問題。確實，編譯器確實抱怨這個，但代碼實際上編譯。感謝@WhozCraig和@ n.m堅持認爲這不是一個錯誤，我注意到它實際上正在建設中。謝謝！爲了將來的參考，我確實發佈了整個消息：

**** Build of configuration Debug for project ADS **** 
make all 
Building file: ../src/bag_test.cpp 

Invoking: GCC C++ Compiler 
g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/bag_test.d" -MT"src/bag_test.d" -o "src/bag_test.o" "../src/bag_test.cpp" 
In file included from ../src/bag_test.cpp:2:0: 
../src/bag.h:23:66: warning: friend declaration ‘std::ostream& operator<<(std::ostream&, const bag<DataType>&)’ declares a non-template function [-Wnon-template-friend] 
../src/bag.h:23:66: note: (if this is not what you intended, make sure the function template has already been declared and add <> after the function name here) 
In file included from ../src/bag.h:2:0, 
       from ../src/bag_test.cpp:2: 
../src/vector.h: In instantiation of ‘vector<DataType>::vector(int) [with DataType = int]’: 
../src/bag.h:34:53: required from ‘bag<DataType>::bag(int) [with DataType = int]’ 
../src/bag_test.cpp:6:17: required from here 
../src/vector.h:100:6: warning: ‘vector<int>::vect_capacity’ will be initialized after [-Wreorder] 
../src/vector.h:99:6: warning: ‘int vector<int>::vect_size’ [-Wreorder] 
../src/vector.h:108:1: warning: when initialized here [-Wreorder] 
Finished building: ../src/bag_test.cpp 

Building target: ADS 
Invoking: GCC C++ Linker 
g++ -o "ADS" ./src/bag_test.o 
Finished building target: ADS 

**** Build Finished ****