C++ 在C+中未使用新运算符时发生内存泄漏+；

我目前正在为我的类重新创建一个基本的linux shell，我在valgrind检测内存泄漏时遇到了问题，即使没有使用新的操作符。我不知道该看哪里，我也无法从valgrind错误消息中得到任何信息。如果有人知道内存泄漏的来源，我们将不胜感激。谢谢大家!

==26432== 
==26432== HEAP SUMMARY:
==26432==     in use at exit: 61 bytes in 2 blocks
==26432==   total heap usage: 268 allocs, 266 frees, 28,546 bytes allocated
==26432== 
==26432== 29 bytes in 1 blocks are possibly lost in loss record 1 of 2
==26432==    at 0x4C2B0E0: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==26432==    by 0x4EF1208: std::string::_Rep::_S_create(unsigned long, unsigned long, std::allocator<char> const&) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==26432==    by 0x4EF1DCA: std::string::_Rep::_M_clone(std::allocator<char> const&, unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==26432==    by 0x4EF1E63: std::string::reserve(unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==26432==    by 0x4EACF5E: std::basic_istream<char, std::char_traits<char> >& std::getline<char, std::char_traits<char>, std::allocator<char> >(std::basic_istream<char, std::char_traits<char> >&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, char) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==26432==    by 0x401895: main (in /home/randyhe/Documents/FALL2015/CS100/rshell/bin/rshell)
==26432== 
==26432== 32 bytes in 1 blocks are possibly lost in loss record 2 of 2
==26432==    at 0x4C2B0E0: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==26432==    by 0x4EF1208: std::string::_Rep::_S_create(unsigned long, unsigned long, std::allocator<char> const&) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==26432==    by 0x4EF2930: char* std::string::_S_construct<char const*>(char const*, char const*, std::allocator<char> const&, std::forward_iterator_tag) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==26432==    by 0x4EF2D47: std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==26432==    by 0x401826: main (in /home/randyhe/Documents/FALL2015/CS100/rshell/bin/rshell)
==26432== 
==26432== LEAK SUMMARY:
==26432==    definitely lost: 0 bytes in 0 blocks
==26432==    indirectly lost: 0 bytes in 0 blocks
==26432==      possibly lost: 61 bytes in 2 blocks
==26432==    still reachable: 0 bytes in 0 blocks
==26432==         suppressed: 0 bytes in 0 blocks
==26432== 
==26432== For counts of detected and suppressed errors, rerun with: -v

==26432==
==26432==堆摘要：
==26432==在出口处使用：2个块中有61个字节
==26432==总堆使用率：268个allocs，266个free，28546个字节已分配
==26432== 
==26432==1个块中的29个字节可能在丢失记录1（共2个）中丢失
==26432==at 0x4C2B0E0:运算符新（无符号长）（在/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so中）
==26432==by 0x4EF1208:std:：string:：_Rep:：_S_create（无符号长、无符号长、std:：分配器常量&）（in/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
==26432==by 0x4EF1DCA:std:：string:：_Rep:：_M_clone（std:：allocator const&，unsigned long）（in/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
==26432==by 0x4EF1E63:std:：string:：reserve（无符号长）（in/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
==26432==by 0x4EACF5E:std:：basic_istream&std:：getline（std:：basic_istream&，std:：basic_string&，char）（in/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
==26432==by 0x401895:main（in/home/randyhe/Documents/FALL2015/CS100/rshell/bin/rshell）
==26432== 
==26432==1个块中的32个字节可能在丢失记录2（共2个）中丢失
==26432==at 0x4C2B0E0:运算符新（无符号长）（在/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so中）
==26432==by 0x4EF1208:std:：string:：_Rep:：_S_create（无符号长、无符号长、std:：分配器常量&）（in/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
==26432==by 0x4EF2930:char*std:：string:：_S_构造（char const*，char const*，std:：allocator const&，std:：forward_iterator_标记）（in/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
==26432==by 0x4EF2D47:std:：basic_string:：basic_string（char const*，std:：allocator const&）（in/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
==26432==0x401826:main（in/home/randyhe/Documents/FALL2015/CS100/rshell/bin/rshell）
==26432== 
==26432==泄漏摘要：
==26432==肯定丢失：0个块中有0个字节
==26432==间接丢失：0个块中有0个字节
==26432==可能丢失：2个块中有61个字节
==26432==仍然可访问：0个块中有0个字节
==26432==抑制：0个块中有0个字节
==26432== 
==26432==对于检测到的和抑制的错误计数，请使用：-v重新运行

下面是我代码的一部分

#include <iostream>
#include <vector>
#include <queue>
#include <utility>
#include <sstream>
#include <string>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <stdio.h>
#include <sys/wait.h>
#include <errno.h>
#include <limits.h>
#include <pwd.h>

std::pair<std::vector<std::vector<std::string> >, std::queue<std::string> >
    parseInput(std::string s, bool& b);
void check(std::string singleWord, std::string keyword, bool& b, int& index,
        std::vector<std::vector<std::string> >& v, std::queue<std::string>& q);
void executeAll(std::pair<std::vector<std::vector<std::string> >,
    std::queue<std::string> > p);
void printCommands(const std::vector<std::vector<std::string> >& v);
void printConnectors(std::queue<std::string> q);
bool executeSingle(std::vector<std::string>& v);
std::vector<char*> toCharPointers(std::vector<std::string>& v);
char* getHost();

int main()
{
    // Store hostname into character array object hostname
    char hostname[HOST_NAME_MAX];
    int status = gethostname(hostname, HOST_NAME_MAX);
    if(status != 0)
    {
        perror("gethostname failed");
        exit(errno);
    }

    // Store username to login object
    struct passwd *pws;
    pws = getpwuid(geteuid());
    if(pws == NULL)
    {
        perror("getid failed");
        exit(errno);
    }
    std::string login = pws->pw_name;

    for(;;)
    {
        // Output login and hostname
        std::cout << login << "@" << hostname << "$ ";

        // Get user input
        std::string userInput;
        std::getline(std::cin, userInput);

        // If user inputs exit, end program
        if(userInput == "exit")
            exit(0);

        // parsedPair holds the list of commands on its .first, and holds
        // the list of connectors on its .second
        bool correctSyntax = true;
        std::pair<std::vector<std::vector<std::string> >, 
            std::queue<std::string> > parsedPair = 
                parseInput(userInput, correctSyntax);

        if(correctSyntax)
            executeAll(parsedPair);
    }
    return 0;
}

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std:：pair
parseInput（标准：：字符串s、bool和b）；
无效检查（std:：string singleWord、std:：string关键字、bool&b、int&index、，
std:：vector&v，std:：queue&q）；
void executeAll（std:：pair p）；
无效打印命令（const std:：vector&v）；
无效打印连接器（标准：：队列q）；
bool executeSingle（std:：vector&v）；
std：：矢量指向指针（std：：矢量和v）；
char*getHost（）；
int main（）
{
//将主机名存储到字符数组对象主机名中
字符主机名[主机名\最大值]；
int status=gethostname（主机名、主机名、最大值）；
如果（状态！=0）
{
perror（“gethostname失败”）；
出口（errno）；
}
//将用户名存储到登录对象
结构passwd*pws；
pws=getpwuid（geteuid（））；
如果（pws==NULL）
{
perror（“getid失败”）；
出口（errno）；
}
std:：string login=pws->pw_name；
对于（；；）
{
//输出登录名和主机名
std：：cout如果你知道如何阅读它，你将确切地看到发生了什么：

==26432== HEAP SUMMARY:
==26432==     in use at exit: 61 bytes in 2 blocks
==26432==   total heap usage: 268 allocs, 266 frees, 28,546 bytes allocated
==26432== 
==26432== 29 bytes in 1 blocks are possibly lost in loss record 1 of 2
==26432==    at 0x4C2B0E0: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==26432==    by 0x4EF1208: std::string::_Rep::_S_create(unsigned long, unsigned long, std::allocator<char> const&) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==26432==    by 0x4EF1DCA: std::string::_Rep::_M_clone(std::allocator<char> const&, unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==26432==    by 0x4EF1E63: std::string::reserve(unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==26432==    by 0x4EACF5E: std::basic_istream<char, std::char_traits<char> >& std::getline<char, std::char_traits<char>, std::allocator<char> >(std::basic_istream<char, std::char_traits<char> >&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, char) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==26432==    by 0x401895: main (in /home/randyhe/Documents/FALL2015/CS100/rshell/bin/rshell)
==26432== 
==26432== 32 bytes in 1 blocks are possibly lost in loss record 2 of 2
==26432==    at 0x4C2B0E0: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==26432==    by 0x4EF1208: std::string::_Rep::_S_create(unsigned long, unsigned long, std::allocator<char> const&) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==26432==    by 0x4EF2930: char* std::string::_S_construct<char const*>(char const*, char const*, std::allocator<char> const&, std::forward_iterator_tag) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==26432==    by 0x4EF2D47: std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==26432==    by 0x401826: main (in /home/randyhe/Documents/FALL2015/CS100/rshell/bin/rshell)
==26432==

==26432==堆摘要：
==26432==在出口处使用：2个块中有61个字节
==26432==总堆使用率：268个allocs，266个free，28546个字节已分配
==26432== 
==26432==1个块中的29个字节可能在丢失记录1（共2个）中丢失
==26432==at 0x4C2B0E0:运算符新（无符号长）（在/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so中）
==26432==by 0x4EF1208:std:：string:：_Rep:：_S_create（无符号长、无符号长、std:：分配器常量&）（in/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
==26432==by 0x4EF1DCA:std:：string:：_Rep:：_M_clone（std:：allocator const&，unsigned long）（in/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
==26432==by 0x4EF1E63:std:：string:：reserve（无符号长）（in/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
==26432==by 0x4EACF5E:std:：basic_istream&std:：getline（std:：basic_istream&，std:：basic_string&，char）（in/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
==26432==by 0x401895:main（in/home/randyhe/Documents/FALL2015/CS100/rshell/bin/rshell）
==26432== 
==26432==1个块中的32个字节可能在丢失记录2（共2个）中丢失
==26432==at 0x4C2B0E0:运算符新（无符号长）（在/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so中）
==26432==by 0x4EF1208:std:：string:：_Rep:：_S_create（无符号长、无符号长、std:：分配器常量&）（in/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
==26432==by 0x4EF2930:char*std:：string:：_S_构造（char const*，char const*，std:：allocator const&，std:：forward_iterator_标记）（in/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
==26432==by 0x4EF2D47:std:：basic_string:：basic_string（char const*，std:：allocator const&）（in/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
==26432==0x401826:main（in/home/randyhe/Documents/FALL2015/CS100/rshell/bin/rshell）
==26432==

这：

==26432==by 0x4EACF5E:std:：basic_istream&std:：getline（std:：basic_istream&，std:：basic_string&，char）（in/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）

这是：

==26432==    by 0x4EF2D47: std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)

==26432==by 0x4EF2D47:std:：basic_string:：basic_string（char const*，std:：allocator const&）（in/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）

这是构造吗
==26432==    by 0x4EF2D47: std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)