is deprecated and will be REMOVED. Please use "?-6ren"> is deprecated and will be REMOVED. Please use "?-我正在学习 C++,所以我正在阅读 Programming: Principles and Practice using C++ 这本书。 我正在进行第一个练习,即如何制作“Hello, World!-6ren">
gpt4 book ai didi

c++ - 如何修复 " is deprecated and will be REMOVED. Please use "?

转载 作者:可可西里 更新时间:2023-11-01 15:51:10 34 4
gpt4 key购买 nike

我正在学习 C++,所以我正在阅读 Programming: Principles and Practice using C++ 这本书。

我正在进行第一个练习,即如何制作“Hello, World!”。使用 Microsoft Visual Studio 2015 编写的程序。我使用了书中提供的源代码。

#include "../../std_lib_facilities.h"  //header file recommended by book
int main() //C++ programs start by executing the function main
{
cout <<"Hello, World!\n"; //output "Hello, World!"
keep_window_open(); //wait for a character to be entered
return 0;
}

但是,当我尝试构建一个可执行程序时收到两个错误,如下所示:

IntelliSense: static assertion failed with "<hash_map> is    
deprecated and will be REMOVED. Please use <unordered_map>. You can define
_SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS to acknowledge that you have
received this warning."
Project: Hello, World!
c:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\include\hash_map
Line 14

Error C2338 <hash_map> is deprecated and will be REMOVED. Please use
<unordered_map>. You can define _SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS to
acknowledge that you have received this warning.
Project: Hello, World!
c:\program files (x86)\microsoft visual studio 14.0\vc\include\hash_map
Line 17

你能告诉我如何纠正这个问题吗?

std_lib_facilities.h中的代码如下:

/*
simple "Programming: Principles and Practice using C++" course header to
be used for the first few weeks.
It provides the most common standard headers (in the global namespace)
and minimal exception/error support.

Students: please don't try to understand the details of headers just yet.
All will be explained. This header is primarily used so that you don't have
to understand every concept all at once.

Revised April 25, 2010: simple_error() added
*/

#ifndef H112
#define H112 201004L

#include<iostream>
#include<fstream>
#include<sstream>
#include<cmath>
#include<cstdlib>
#include<string>
#include<list>
#include<vector>
#include<algorithm>
#include<stdexcept>

//--------------------------------------------------------------------------- ---

#ifdef _MSC_VER
#include <hash_map>
using stdext::hash_map;
#else
#include <ext/hash_map>
using __gnu_cxx::hash_map;

namespace __gnu_cxx {

template<> struct hash<std::string>
{
size_t operator()(const std::string& s) const
{
return hash<char*>()(s.c_str());
}
};

} // of namespace __gnu_cxx
#endif

//--------------------------------------------------------------------------- ---

#define unordered_map hash_map

//--------------------------------------------------------------------------- ---

typedef long Unicode;

//--------------------------------------------------------------------------- ---

using namespace std;

template<class T> string to_string(const T& t)
{
ostringstream os;
os << t;
return os.str();
}

struct Range_error : out_of_range { // enhanced vector range error reporting
int index;
Range_error(int i) :out_of_range("Range error: "+to_string(i)), index(i) { }
};


// trivially range-checked vector (no iterator checking):
template< class T> struct Vector : public std::vector<T> {
typedef typename std::vector<T>::size_type size_type;

Vector() { }
explicit Vector(size_type n) :std::vector<T>(n) {}
Vector(size_type n, const T& v) :std::vector<T>(n,v) {}
template <class I>
Vector(I first, I last) :std::vector<T>(first,last) {}

T& operator[](unsigned int i) // rather than return at(i);
{
if (i<0||this->size()<=i) throw Range_error(i);
return std::vector<T>::operator[](i);
}
const T& operator[](unsigned int i) const
{
if (i<0||this->size()<=i) throw Range_error(i);
return std::vector<T>::operator[](i);
}
};

// disgusting macro hack to get a range checked vector:
#define vector Vector

// trivially range-checked string (no iterator checking):
struct String : std::string {

String() { }
String(const char* p) :std::string(p) {}
String(const string& s) :std::string(s) {}
template<class S> String(S s) :std::string(s) {}
String(int sz, char val) :std::string(sz,val) {}
template<class Iter> String(Iter p1, Iter p2) : std::string(p1,p2) { }

char& operator[](unsigned int i) // rather than return at(i);
{
if (i<0||size()<=i) throw Range_error(i);
return std::string::operator[](i);
}

const char& operator[](unsigned int i) const
{
if (i<0||size()<=i) throw Range_error(i);
return std::string::operator[](i);
}
};

#ifndef _MSC_VER
namespace __gnu_cxx {

template<> struct hash<String>
{
size_t operator()(const String& s) const
{
return hash<std::string>()(s);
}
};

} // of namespace __gnu_cxx
#endif


struct Exit : runtime_error {
Exit(): runtime_error("Exit") {}
};

// error() simply disguises throws:
inline void error(const string& s)
{
throw runtime_error(s);
}

inline void error(const string& s, const string& s2)
{
error(s+s2);
}

inline void error(const string& s, int i)
{
ostringstream os;
os << s <<": " << i;
error(os.str());
}

#if _MSC_VER<1500
// disgusting macro hack to get a range checked string:
#define string String
// MS C++ 9.0 have a built-in assert for string range check
// and uses "std::string" in several places so that macro substitution fails
#endif

template<class T> char* as_bytes(T& i) // needed for binary I/O
{
void* addr = &i; // get the address of the first byte
// of memory used to store the object
return static_cast<char*>(addr); // treat that memory as bytes
}


inline void keep_window_open()
{
cin.clear();
cout << "Please enter a character to exit\n";
char ch;
cin >> ch;
return;
}

inline void keep_window_open(string s)
{
if (s=="") return;
cin.clear();
cin.ignore(120,'\n');
for (;;) {
cout << "Please enter " << s << " to exit\n";
string ss;
while (cin >> ss && ss!=s)
cout << "Please enter " << s << " to exit\n";
return;
}
}



// error function to be used (only) until error() is introduced in Chapter 5:
inline void simple_error(string s) // write ``error: s?? and exit program
{
cerr << "error: " << s << '\n';
keep_window_open(); // for some Windows environments
exit(1);
}

// make std::min() and std::max() accessible:
#undef min
#undef max

#include<iomanip>
inline ios_base& general(ios_base& b) // to augment fixed and scientific
{
b.setf(ios_base::fmtflags(0),ios_base::floatfield);
return b;
}

// run-time checked narrowing cast (type conversion):
template<class R, class A> R narrow_cast(const A& a)
{
R r = R(a);
if (A(r)!=a) error(string("info loss"));
return r;
}


inline int randint(int max) { return rand()%max; }

inline int randint(int min, int max) { return randint(max-min)+min; }

inline double sqrt(int x) { return sqrt(double(x)); } // to match C++0x

#endif

最佳答案

有几种方法可以修复它。您可以通过编写让编译器在 visual studio 中忽略它

#define _SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS 1

在他的头文件的顶部(你可能对他系列的其余部分没问题)。

您也可以将他的 header 重写为 hash_map使用 unordered_map .我不推荐这样做,因为你是编程新手,但 Stack Overflow 上的一些好心人可能会为你做这件事,你可以复制它(一点也不难)。编辑:T.C.找到了here在您帖子的评论部分。

最后,你可以只包含你在书中做的任何单元的必要头文件,并根据需要手动编写他正在使用的任何函数。在这种情况下,要访问 cout 函数,您需要编写 #include <iostream>在你的文件的顶部,然后也写 using namespace std;在你的 int main() 之前.或者,您可以编写 std::cout << "Hello World!";不包括 using namespace std; ,这就是它所做的一切。最终产品看起来像:

#include <iostream>  //for learning, it's probably better to know what each header file does before you use it. silly book.
using namespace std; //act like std:: is before function calls from that library
int main() //C++ programs start by executing the function main
{
cout <<"Hello, World!\n"; //output "Hello, World!"
cin.get(); //wait for a return character to be entered
return 0;
}

看看你是如何开始在 Stack Overflow 上发帖的,并且可能有很高的学习 C++ 的天赋,我建议你学习 C++,并在你读到他的书时和之后尝试看看他的函数到底在做什么在互联网上快速搜索您想学习的任何有趣的东西。

关于c++ - 如何修复 "<hash_map> is deprecated and will be REMOVED. Please use <unordered_map>"?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30811441/

34 4 0