带有模板的字符串不起作用？ [英] Strings with Templates not working?
问题描述
您好，
我正在使用模板来模拟来自Java的LinkedList。它可以在没有
问题的情况下工作，但是当我想要使用时main.cpp中的字符串而不是char *，我
得到以下错误信息：
$ ./Main
终止抛出''std :: logic_error''实例后调用
what（）：basic_string :: _ S_construct NULL无效
我试图导入< ; mainbpp和listT.h中的stringboth，但
errormsg是一样的。
这些类看起来像这样：
MAIN.CPP ----------------------------------------- -
#include" ListT.h"
#include< iostream>
using namespace std;
int main（无效）{
ListT< string * testList = new ListT< string>（）;
testList - > add（" Test1"）;
testList-> add（" Test2"）;
testList-> add（" Te st3"）;
cout<< testList-> get（0）<< endl;
cout<< testList-> get（1）<< endl;
cout<< testList-> get（2）<< endl;
删除testList;
返回0;
}
------------------------------------------- -----
LISTT.H ------------------------------ -----------
模板< class Tclass ListT {
private：
struct TKnoten {
T daten;
int index;
TKnoten * next;
};
int counter;
TKnoten * kopf;
public：
ListT（）;
virtual~ListT（）;
void add（T element）;
// void remove（T element）;
T get（int i）;
};
模板< class T>
ListT< T>： ：ListT（）{
counter = 0;
kopf = new TKnoten（）;
kopf-> next = 0;
}
模板< class T>
ListT< T> ::〜ListT（）{
while（kopf-> next！= 0）{
TKnoten * previous = new TKn oten（）;
previous = kopf;
kopf = kopf-> next;
删除之前;
}
删除kopf;
}
模板< class T>
void ListT< ; T> :: add（T元素）{
TKnoten * newKnoten = new TKnoten（）;
newKnoten-> next = kopf;
kopf = newKnoten;
kopf-> daten = element;
kopf-> index = counter;
counter ++;
}
template< class T>
T ListT< T> :: get（int i）{
TKnoten * iterator = new TKnoten（）;
T daten = 0;
iterator = kopf;
while（iterator-> next！= 0）{
if（iterator-> index == i）{
daten = iterator-> daten;
}
iterator = iterator-> next;
}
删除迭代器;
return daten;
}
字符串类型有什么问题？我正在使用Linux和gcc（g ++），
感谢您的回答，
Markus
Hello,
I''m using a template to simulate a LinkedList from Java.It works without
problems, but when I want to use strings in main.cpp instead of char*, I
get the following error message:
$ ./Main
terminate called after throwing an instance of ''std::logic_error''
what(): basic_string::_S_construct NULL not valid
I tried to import <stringboth in main.cpp and listT.h, but the
errormsg was the same.
The classes look like this:
MAIN.CPP------------------------------------------
#include "ListT.h"
#include <iostream>
using namespace std;
int main(void) {
ListT<string*testList = new ListT<string>();
testList->add("Test1");
testList->add("Test2");
testList->add("Test3");
cout << testList->get(0) <<endl;
cout << testList->get(1) <<endl;
cout << testList->get(2) <<endl;
delete testList;
return 0;
}
------------------------------------------------
LISTT.H-----------------------------------------
template <class Tclass ListT {
private:
struct TKnoten {
T daten;
int index;
TKnoten *next;
};
int counter;
TKnoten *kopf;
public:
ListT();
virtual ~ListT();
void add(T element);
//void remove(T element);
T get(int i);
};
template <class T>
ListT<T>::ListT() {
counter = 0;
kopf = new TKnoten();
kopf->next = 0;
}
template <class T>
ListT<T>::~ListT() {
while (kopf->next != 0) {
TKnoten *previous = new TKnoten();
previous = kopf;
kopf = kopf->next;
delete previous;
}
delete kopf;
}
template <class T>
void ListT<T>::add(T element) {
TKnoten *newKnoten = new TKnoten();
newKnoten->next = kopf;
kopf = newKnoten;
kopf->daten = element;
kopf->index = counter;
counter++;
}
template <class T>
T ListT<T>::get(int i) {
TKnoten *iterator = new TKnoten();
T daten = 0;
iterator = kopf;
while (iterator->next != 0) {
if (iterator->index == i) {
daten = iterator->daten;
}
iterator = iterator->next;
}
delete iterator;
return daten;
}
What''s wrong with string as type? I''m using Linux with gcc (g++),
Thanks for your answers,
Markus
推荐答案
./ Main
在抛出''std :: logic_error'的实例后终止调用
what（）：basic_string :: _S_construct NULL无效
我试图在main.cpp和listT.h中导入< stringboth，但
errormsg是相同的。
课程如下：
MAIN.CPP -------------------- ----------------------
#include" ListT.h"
#include< iostream>
使用命名空间std;
int main（无效）{
ListT< string * testList = new ListT< string>（）;
testList-> add（" Test1"）;
testList-> add（" Test2" ）;
testList-> add（" Test3"）;
cout<< testList-> get（0）<< endl;
cout<< testList-> get（1）<< endl;
cout<< testList-> get（2）<< endl;
删除testList;
返回0;
}
------------------------------------------- -----
LISTT.H ------------------------------ -----------
模板< class Tclass ListT {
private：
struct TKnoten {
T daten;
int index;
TKnoten * next;
};
int counter;
TKnoten * kopf;
public：
ListT（）;
virtual~ListT（）;
void add（T element）;
// void remove（T element）;
T get（int i）;
};
模板< class T>
ListT< T>： ：ListT（）{
counter = 0;
kopf = new TKnoten（）;
kopf-> next = 0;
}
模板< class T>
ListT< T> ::〜ListT（）{
while（kopf-> next！= 0）{
TKnoten * previous = new TKn oten（）;
previous = kopf;
kopf = kopf-> next;
删除之前;
}
删除kopf;
}
模板< class T>
void ListT< ; T> :: add（T元素）{
TKnoten * newKnoten = new TKnoten（）;
newKnoten-> next = kopf;
kopf = newKnoten;
kopf-> daten = element;
kopf-> index = counter;
counter ++;
}
template< class T>
T ListT< T> :: get（int i）{
TKnoten * iterator = new TKnoten（）;
T daten = 0;
iterator = kopf;
while（iterator-> next！= 0）{
if（iterator-> index == i）{
daten = iterator-> daten;
}
iterator = iterator-> next;
}
删除迭代器;
return daten;
}
字符串类型有什么问题？我正在使用Linux和gcc（g ++），
感谢您的回答，
Markus
./Main
terminate called after throwing an instance of ''std::logic_error''
what(): basic_string::_S_construct NULL not valid
I tried to import <stringboth in main.cpp and listT.h, but the
errormsg was the same.
The classes look like this:
MAIN.CPP------------------------------------------
#include "ListT.h"
#include <iostream>
using namespace std;
int main(void) {
ListT<string*testList = new ListT<string>();
testList->add("Test1");
testList->add("Test2");
testList->add("Test3");
cout << testList->get(0) <<endl;
cout << testList->get(1) <<endl;
cout << testList->get(2) <<endl;
delete testList;
return 0;
}
------------------------------------------------
LISTT.H-----------------------------------------
template <class Tclass ListT {
private:
struct TKnoten {
T daten;
int index;
TKnoten *next;
};
int counter;
TKnoten *kopf;
public:
ListT();
virtual ~ListT();
void add(T element);
//void remove(T element);
T get(int i);
};
template <class T>
ListT<T>::ListT() {
counter = 0;
kopf = new TKnoten();
kopf->next = 0;
}
template <class T>
ListT<T>::~ListT() {
while (kopf->next != 0) {
TKnoten *previous = new TKnoten();
previous = kopf;
kopf = kopf->next;
delete previous;
}
delete kopf;
}
template <class T>
void ListT<T>::add(T element) {
TKnoten *newKnoten = new TKnoten();
newKnoten->next = kopf;
kopf = newKnoten;
kopf->daten = element;
kopf->index = counter;
counter++;
}
template <class T>
T ListT<T>::get(int i) {
TKnoten *iterator = new TKnoten();
T daten = 0;
iterator = kopf;
while (iterator->next != 0) {
if (iterator->index == i) {
daten = iterator->daten;
}
iterator = iterator->next;
}
delete iterator;
return daten;
}
What''s wrong with string as type? I''m using Linux with gcc (g++),
Thanks for your answers,
Markus
2007年6月20日星期三21:41:13 +0200，Markus Pitha写道：
On Wed, 20 Jun 2007 21:41:13 +0200, Markus Pitha wrote:
您好，
我正在使用模板来模拟来自Java的LinkedList。它没有
问题，但是当我想在main.cpp中使用字符串而不是char *时，我
收到以下错误消息：
Hello,
I''m using a template to simulate a LinkedList from Java.It works without
problems, but when I want to use strings in main.cpp instead of char*, I
get the following error message:
./ Main
在抛出''std实例后终止调用： ：logic_error''
what（）：basic_string :: _ S_construct NULL无效
我试图在main.cpp和listT.h中导入< stringboth ，但
errormsg是一样的。
课程如下：
./Main
terminate called after throwing an instance of ''std::logic_error''
what(): basic_string::_S_construct NULL not valid
I tried to import <stringboth in main.cpp and listT.h, but the
errormsg was the same.
The classes look like this:
[snip]
[snip]
template< class T>
T ListT< T> :: get（int i）{
TKnoten * iterator = new TKnoten（）;
T daten = 0;
template <class T>
T ListT<T>::get(int i) {
TKnoten *iterator = new TKnoten();
T daten = 0;
！---->> ^^^^^^^^^^^
T daten ="" ;;
!---->>^^^^^^^^^^^
T daten = "";
iterator = kopf;
while（iterator-> next！= 0）{
if（iterator-> index == i）{
daten = iterator-> daten;
}
iterator = iterator-> next;
}
删除迭代器;
返回daten;
}
字符串类型有什么问题？我正在使用Linux和gcc（g ++），
iterator = kopf;
while (iterator->next != 0) {
if (iterator->index == i) {
daten = iterator->daten;
}
iterator = iterator->next;
}
delete iterator;
return daten;
}
What''s wrong with string as type? I''m using Linux with gcc (g++),
-
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