[英]error: strcpy was not declared in this scope
I get this problem in a c++ problem compiling in Ubuntu g++ version 4.4.3.我在 Ubuntu g++ 版本 4.4.3 中编译的 c++ 问题中遇到了这个问题。 I dont know the headers to include to solve this problem.. Thanks
我不知道要包含的标题来解决这个问题..谢谢
centro_medico.cpp: In constructor ‘Centro_medico::Centro_medico(char*, char*, int, int, float)’:
centro_medico.cpp:5: error: ‘strcpy’ was not declared in this scope
centro_medico.cpp:13: warning: deprecated conversion from string constant to ‘char*’
centro_medico.cpp:13: warning: deprecated conversion from string constant to ‘char*’
centro_medico.cpp: In member function ‘Centro_medico& Centro_medico::operator=(const Centro_medico&)’:
centro_medico.cpp:26: error: ‘strcpy’ was not declared in this scope
centro_medico.cpp:39: warning: deprecated conversion from string constant to ‘char*’
centro_medico.cpp:39: warning: deprecated conversion from string constant to ‘char*’
centro_medico.cpp: In member function ‘bool Centro_medico::quitar_medico(int)’:
centro_medico.cpp:92: warning: deprecated conversion from string constant to ‘char*’
centro_medico.cpp:92: warning: deprecated conversion from string constant to ‘char*’
centro_medico.cpp: In member function ‘void Centro_medico::mostrar_especialidades(std::ostream&) const’:
centro_medico.cpp:123: error: ‘strcmpi’ was not declared in this scope
centro_medico.cpp: In member function ‘void Centro_medico::mostrar_horarios_consulta(char*) const’:
centro_medico.cpp:162: error: ‘strcmpi’ was not declared in this scope
centro_medico.cpp: In member function ‘void Centro_medico::crea_medicos()’:
centro_medico.cpp:321: warning: deprecated conversion from string constant to ‘char*’
centro_medico.cpp:321: warning: deprecated conversion from string constant to ‘char*’
medico.cpp medico.cpp
#include "medico.h"
#include <cstdlib>
#include <iostream>
#include <stdlib>
#include<cstring>
#include<string>
long Medico::total_consultas=0;
Medico::Medico(char *nom,char * espe,int colegiado,int trabajo)
{
int i;
strcpy(nombre,nom);
strcpy(especialidad,espe);
num_colegiado=colegiado;
num_horas_diarias=trabajo;
citas_medico= new Cita*[5]; // 5 Días de las semana, de Lunes a Viernes.
for (i=0;i<5;i++)
citas_medico[i]=new Cita[num_horas_diarias];
}
Medico::Medico(const Medico &m){
int i;
citas_medico=new Cita*[5];
for (i=0;i<5;i++)
citas_medico[i]=NULL;
(*this) = m;
}
Medico &Medico::operator=(const Medico &m){
int i,j;
if (this != &m) { // Para evitar la asignación de un objeto a sí mismo
strcpy(nombre,m.nombre);
strcpy(especialidad,m.especialidad);
num_colegiado=m.num_colegiado;
num_horas_diarias=m.num_horas_diarias;
for (i=0;i<5;i++){
delete citas_medico[i];
citas_medico[i]=new Cita[num_horas_diarias];
for(j=0;j<num_horas_diarias;j++){
citas_medico[i][j] = m.citas_medico[i][j] ;
}
}
}
return *this;
}
medico.h medico.h
#pragma once
#include <cstdlib>
#include <iostream>
using namespace std;
#include "cita.h"
class Medico
{
private:
char nombre[50];
char especialidad[50];
int num_colegiado;
int num_horas_diarias;
Cita **citas_medico;
static long total_consultas;
public:
void mostrar_calendario_citas(ostream &o=cout) const;
bool asignar_cita(int d, int hor,Paciente *p=NULL);
void anular_cita(int d, int hor);
bool consultar_cita(char dni[10], int modificar=0);
void modificar_cita(int d, int hor);
void vaciar_calendario_citas();
void borrar_calendario_citas();
char* get_especialidad(char espec[50]) const;
char* get_nombre(char n[50]) const;
int get_num_colegiado() const;
int get_num_horas() const;
void set_num_horas(int horas);
void mostrar_info(ostream &o=cout) const;
static long get_total_consultas();
Cita* operator[](int dia);
void eliminar_calendario_citas();
void crear_calendario_citas();
Medico(char *nom,char * espe,int colegiado,int trabajo);
Medico(const Medico &m);
Medico &operator=(const Medico &c);
void operator delete(void*);
~Medico();
};
ostream& operator<<(ostream &o, Medico &c);
ofstream& operator<<(ofstream &fichero, Medico &m);
ifstream& operator>>(ifstream &fichero, Medico &m);
Observations:观察:
#include <cstring>
should introduce std::strcpy(). #include <cstring>
应该引入 std::strcpy()。using namespace std;
(as written in medico.h) introduces any identifiers from std::
into the global namespace. std::
任何标识符引入全局命名空间。 Aside from using namespace std;
除了
using namespace std;
being somewhat clumsy once the application grows larger (as it introduces one hell of a lot of identifiers into the global namespace), and that you should never use using
in a header file (see below!), using namespace
does not affect identifiers introduced after the statement.一旦应用程序变大就会有点笨拙(因为它在全局命名空间中引入了一大堆标识符),并且你永远不应该在头文件中使用
using
(见下文!), using namespace
不会影响之后引入的标识符该声明。
( using namespace std
is written in the header, which is included in medico.cpp, but #include <cstring>
comes after that.) (
using namespace std
写在头文件中,该头文件包含在 medico.cpp 中,但#include <cstring>
紧随其后。)
My advice: Put the using namespace std;
我的建议:把
using namespace std;
(if you insist on using it at all) into medico.cpp, after any includes , and use explicit std::
in medico.h. (如果你坚持使用它)进入 medico.cpp,在任何包含之后,并在 medico.h 中使用显式
std::
。
strcmpi()
is not a standard function at all; strcmpi()
根本不是标准函数; while being defined on Windows, you have to solve case-insensitive compares differently on Linux.在 Windows 上定义时,您必须在 Linux 上以不同的方式解决不区分大小写的比较。
(On general terms, I would like to point to this answer with regards to "proper" string handling in C and C++ that takes Unicode into account, as every application should. Summary: The standard cannot handle these things correctly; do use ICU .) (一般来说,我想指出这个关于在 C 和 C++ 中考虑 Unicode 的“正确”字符串处理的答案,因为每个应用程序都应该考虑。总结:标准无法正确处理这些事情;请使用ICU 。 )
warning: deprecated conversion from string constant to ‘char*’
A "string constant" is when you write a string literal (eg "Hello"
) in your code. “字符串常量”是指您在代码中编写字符串文字(例如
"Hello"
)。 Its type is const char[]
, ie array of constant characters (as you cannot change the characters).它的类型是
const char[]
,即常量字符数组(因为您不能更改字符)。 You can assign an array to a pointer, but assigning to char *
, ie removing the const
qualifier, generates the warning you are seeing.您可以将数组分配给指针,但分配给
char *
,即删除const
限定符,会生成您看到的警告。
OT clarification: using
in a header file changes visibility of identifiers for anyone including that header, which is usually not what the user of your header file wants. OT澄清:
using
头文件改变标识符的可见性,任何人包括头,这通常不是你的头文件的用户想要什么。 For example, I could use std::string
and a self-written ::string
just perfectly in my code, unless I include your medico.h , because then the two classes will clash.例如,我可以在我的代码中完美地使用
std::string
和自写的::string
,除非我包含您的 medico.h ,否则这两个类会发生冲突。
Don't use using
in header files.不要在头文件中使用
using
。
And even in implementation files, it can introduce lots of ambiguity.即使在实现文件中,它也会引入很多歧义。 There is a case to be made to use explicit namespacing in implementation files as well.
在实现文件中也可以使用显式命名空间。
When you say:当你说:
#include <cstring>
the g++ compiler should put the <string.h>
declarations it itself includes into the std::
AND the global namespaces. g++ 编译器应该将它自己包含的
<string.h>
声明放入std::
和全局命名空间中。 It looks for some reason as if it is not doing that.它看起来出于某种原因,好像它没有这样做。 Try replacing one instance of
strcpy
with std::strcpy
and see if that fixes the problem.尝试用
std::strcpy
替换strcpy
一个实例,看看是否能解决问题。
This error sometimes occurs in a situation like this:在这样的情况下有时会发生此错误:
#ifndef NAN
#include <stdlib.h>
#define NAN (strtod("NAN",NULL))
#endif
static void init_random(uint32_t initseed=0)
{
if (initseed==0)
{
struct timeval tv;
gettimeofday(&tv, NULL);
seed=(uint32_t) (4223517*getpid()*tv.tv_sec*tv.tv_usec);
}
else
seed=initseed;
#if !defined(CYGWIN) && !defined(__INTERIX)
//seed=42
//SG_SPRINT("initializing random number generator with %d (seed size %d)\n", seed, RNG_SEED_SIZE)
initstate(seed, CMath::rand_state, RNG_SEED_SIZE);
#endif
}
If the following code lines not run in the run-time:如果以下代码行未在运行时运行:
#ifndef NAN
#include <stdlib.h>
#define NAN (strtod("NAN",NULL))
#endif
you will face with an error in your code like something as follows;您将在代码中遇到如下错误; because initstate is placed in the stdlib.h file and it's not included :
因为initstate被放置在stdlib.h文件中,它不包括在内:
In file included from ../../shogun/features/SubsetStack.h:14:0,
from ../../shogun/features/Features.h:21,
from ../../shogun/ui/SGInterface.h:7,
from MatlabInterface.h:15,
from matlabInterface.cpp:7:
../../shogun/mathematics/Math.h: In static member function 'static void shogun::CMath::init_random(uint32_t)':
../../shogun/mathematics/Math.h:459:52: error: 'initstate' was not declared in this scope
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