实现c++中的string

发表于

c++经典面试题

以下代码来源于
https://github.com/chenshuo/recipes/blob/fcf9486f5155117fb8c36b6b0944c5486c71c421/string/StringTrivial.h

自己记录下来，留作笔记。

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pragma once

#include<utility>
#include<assert.h>
#include<string.h>

class String
{
public:
    String():data_(new char[1]){
        *data_ = '\0';
    }
    String(const char* str):data_(new char[strlen(str)+1])
    {
        strcpy(data_, str);
    }
    String(const String &rhs):data_(new char[rhs.size()+1])
    {
        strcpy(data_, rhs.c_str());
    }
    String& operaotr=(String rhs)
    {
        swap(rhs.data_);
        return *this;
    }
    ~String() noexcept
    {
        delete[] data_;
    }
    String(String&& rhs)noexcept:data_(rhs.data_)
    {
        rhs.data_ = nullptr;
    }
    size_t size() const
    {
        return strlen(data_);
    }
    const char* c_str() const
    {
        return data_;
    }
    void swap(String& rhs)
    {
        std::swap(data_, rhs.data_);
    }
private:
    char* data_;
};