[英]Trouble with unique_ptr : not a member of 'std'
I have a hard time finding why compiler tell me this: 我很难找到为什么编译器告诉我这个:
main.cpp:51:17: error: ‘unique_ptr’ in namespace ‘std’ does not name a template type
static std::unique_ptr<Pizza> createPizza(PizzaType t_pizza)
and this: 和这个:
main.cpp:69:5: error: ‘unique_ptr’ is not a member of ‘std’
std::unique_ptr<Pizza> pizza = PizzaFactory::createPizza(t_pizzaType);
I have the include for unique_ptr 我有unique_ptr的include
#include <memory>
and I use the good C++ compilation flags 我使用了很好的C ++编译标志
CFLAGS = -std=c++11 -W -Wall -Wextra -Werror -pedantic
I have already try using namespace std ; 我已经尝试使用namespace std ;
Here are the block of code where I use std::unique_ptr 这是我使用std :: unique_ptr的代码块
class PizzaFactory
{
public:
enum PizzaType
{
Hawaiian,
Vegetarian,
Carnivoro
};
static std::unique_ptr<Pizza> createPizza(PizzaType t_pizza)
{
switch (t_pizza)
{
case Hawaiian:
return std::unique_ptr<HawaiianPizza>(new HawaiianPizza());
case Vegetarian:
return std::unique_ptr<VegetarianPizza>(new VegetarianPizza());
case Carnivoro:
return std::unique_ptr<CarnivoroPizza>(new CarnivoroPizza());
default:
throw "Invalid pizza type.";
}
}
};
void pizza_information(PizzaFactory::PizzaType t_pizzaType)
{
std::unique_ptr<Pizza> pizza = PizzaFactory::createPizza(t_pizzaType);
std::cout << "Price of " << t_pizzaType << "is " << pizza->getPrice() << '\n';
}
I really can find what's wrong with this code, please help 我真的可以找到这个代码有什么问题,请帮忙
Thank you. 谢谢。
edit. 编辑。
Here is the Makefile I use: 这是我使用的Makefile:
NAME = plazza
G++ = g++
CFLAGS = -W -Wall -Wextra -Werror -std=c++11
SRC = main.cpp
OBJ = $(SRC:.cpp=.o)
RM = rm -rf
all: $(NAME)
$(NAME): $(OBJ)
$(G++) $(CFLAGS) $(OBJ) -o $(NAME)
clean:
$(RM) $(OBj)
fclean: clean
$(RM) $(NAME)
re: fclean all
edit2. EDIT2。
Here a smal code that give me the same errors: 这里有一个小代码,给我相同的错误:
#include <memory>
#include <iostream>
class Hi
{
public:
void sayHi(const std::string &t_hi)
{
std::cout << t_hi << '\n';
}
};
int main()
{
auto hi = std::unique_ptr<Hi>(new Hi());
hi->sayHi("Salut");
return 0;
}
compile with the Makefile above you should have the error 使用上面的Makefile编译你应该有错误
CFLAGS
is for C compilers. CFLAGS
适用于C编译器。 You are using C++ and a C++ compiler. 您正在使用C ++和C ++编译器。 Use
CXXFLAGS
in your Makefile to set C++ compiler's flags: 在Makefile中使用
CXXFLAGS
来设置C ++编译器的标志:
NAME = plazza
G++ = g++
CXXFLAGS = -W -Wall -Wextra -Werror -std=c++11
SRC = main.cpp
Since you are setting C flags, C++11 is not enabled because -std=c++11
is not passed to your C++ compiler. 由于您正在设置C标志,因此未启用C ++ 11,因为
-std=c++11
未传递给您的C ++编译器。 If you compiled with a C compiler, the compiler (at least GCC does it AFAIK) would warn about the C++ flag being set on the C compiler. 如果您使用C编译器进行编译,编译器(至少GCC会将其设置为AFAIK)会警告C编译器上设置的C ++标志。 You could use
make VERBOSE=1
in these kind of compiler error situations for debugging. 您可以在这些编译器错误情况下使用
make VERBOSE=1
进行调试。
Try adding 尝试添加
#include <memory>
To the top of your file. 到您文件的顶部。
If you are creating cmake project, you can add a line of code to CmakeLists.txt as shown below. 如果要创建cmake项目,可以向CmakeLists.txt添加一行代码,如下所示。
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
Ethereal has explained the details of the reason for the error. Ethereal已经解释了错误原因的细节。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.