C++错误:请求转换为非标量类型？

Question

我是C++的新手,我正在尝试使用名为FlexString的容器类构建链接列表.在main()中,我想通过简单地说:"FlexString flex_str = new FlexString();"来实例化FlexString类.调用构造函数等但它不会编译,错误在底部.这是我的代码:

    //FlexString.h file
#ifndef FLEXSTRING_CAMERON_H
#define FLEXSTRING_CAMERON_H
#include "LinkedList.h"
#include <string>

using namespace std;
using oreilly_A1::LinkedList;

namespace oreilly_A1 {
class FlexString {
public:

    FlexString();
    void store(std::string& s);
    size_t length();
    bool empty();
    std::string value();
    size_t count();




private:

    LinkedList data_list;

};
}
#endif

这是FlexString类的.cpp文件:

#include "FlexString.h"
#include "LinkedList.h"
#include <string>

using namespace std;

namespace oreilly_A1 {
    FlexString::FlexString() {

    }

    void FlexString::store(string& s) {
        data_list.list_head_insert(s);
    }

    std::string value() {
        data_list.list_getstring(); 
    }

}

这是主程序文件.

#include <iostream>
#include <cstdlib>
#include "FlexString.h"

using namespace std;
using oreilly_A1::FlexString;

int main() {

    FlexString flex_str = new FlexString();
    cout << "Please enter a word: " << endl;
    string new_string;
    cin >> new_string;

    flex_str.store(new_string);

    cout << "The word you stored was: "+ flex_str.value() << endl;

}

错误:从'oreilly_A1 :: FlexString*'转换为非标量类型'oreilly_A1 :: FlexString'请求."FlexString flex_str = new FlexString();"

Answer 1

FlexString flex_str = new FlexString();

这是错误的,因为赋值的RHS是指向FlexStringLHS是一个对象的指针.

您可以使用:

// Use the default constructor to construct an object using memory
// from the stack.
FlexString flex_str;

要么

// Use the default constructor to construct an object using memory
// from the free store.
FlexString* flex_str = new FlexString();