不能 __declspec(dllexport) 独立的类

问题描述

假设我有一个 myarray.h 文件：

#pragma once

#include "pch.h"

namespace marr {

    template <typename T>
    class __declspec(dllexport) myarray {
    private:
        T* arr = NULL;
        int capacity;
    public:
        myarray(int initialCapacity = 0) {
            if (initialCapacity != 0)
                this->arr = new T[initialCapacity];
            this->capacity = initialCapacity;
        }
        T& operator[](int index) {
            if (this->capacity <= index)
                this->growCapacityTo(index + 1);
            return this->arr[index];
        }
        ~myarray() {
            delete[] this->arr;
        }
    private:
        void growCapacityTo(int count) {
            T* newarr = new T[count];
            for (int i = 0; i < this->capacity; ++i)
                newarr[i] = this->arr[i];
            this->capacity = count;
            delete[] this->arr;
            this->arr = newarr;
        }
    };

}

还有myarray.cpp：

#include "pch.h"
#include "myarray.h"
// nothing

在 Visual Studio 中构建上述内容不会创建 .lib 文件。

删除模板不会改变这一事实：

class __declspec(dllexport) myarray {
    private:
        int* arr = NULL;
        int capacity;
    public:
        myarray(int initialCapacity = 0) {
            if (initialCapacity != 0)
                this->arr = new int[initialCapacity];
            this->capacity = initialCapacity;
        }
        int& operator[](int index) {
            if (this->capacity <= index)
                this->growCapacityTo(index + 1);
            return this->arr[index];
        }
        ~myarray() {
            delete[] this->arr;
        }
    private:
        void growCapacityTo(int count) {
            int* newarr = new int[count];
            for (int i = 0; i < this->capacity; ++i)
                newarr[i] = this->arr[i];
            this->capacity = count;
            delete[] this->arr;
            this->arr = newarr;
        }
    };

}

在头文件中添加一个随机函数，确实会导致创建 .lib 文件，例如：

__declspec(dllexport) int test() {
    return 0;
}

这是正确的和预期的行为吗？

解决方法

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