[英]error: ‘unique_ptr’ is not a member of ‘std’
I guess it's pretty self explanatory - I can't seem to use C++11 features, even though I think I have everything set up properly - which likely means that I don't.我想这是不言自明的 - 我似乎无法使用 C++11 功能,即使我认为我已经正确设置了所有内容 - 这可能意味着我没有。
Here's my code:这是我的代码:
#include <cstdlib>
#include <iostream>
class Object {
private:
int value;
public:
Object(int val) {
value = val;
}
int get_val() {
return value;
}
void set_val(int val) {
value = val;
}
};
int main() {
Object *obj = new Object(3);
std::unique_ptr<Object> smart_obj(new Object(5));
std::cout << obj->get_val() << std::endl;
return 0;
}
Here's my version of g++:这是我的 g++ 版本:
ubuntu@ubuntu:~/Desktop$ g++ --version
g++ (Ubuntu/Linaro 4.7.3-2ubuntu1~12.04) 4.7.3
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Here's how I'm compiling the code:这是我编译代码的方式:
ubuntu@ubuntu:~/Desktop$ g++ main.cpp -o run --std=c++11
main.cpp: In function ‘int main()’:
main.cpp:25:2: error: ‘unique_ptr’ is not a member of ‘std’
main.cpp:25:24: error: expected primary-expression before ‘>’ token
main.cpp:25:49: error: ‘smart_obj’ was not declared in this scope
Note that I've tried both -std=c++11
and -std=c++0x
to no avail.请注意,我尝试了
-std=c++11
和-std=c++0x
都无济于事。
I'm running Ubuntu 12.04 LTS from a flash drive on an Intel x64 machine.我正在 Intel x64 机器上从闪存驱动器运行 Ubuntu 12.04 LTS。
You need to include header where unique_ptr
and shared_ptr
are defined您需要包含定义
unique_ptr
和shared_ptr
标头
#include <memory>
As you already knew that you need to compile with c++11
flag正如您已经知道的,您需要使用
c++11
标志进行编译
g++ main.cpp -o run -std=c++11
// ^
So here what I learned in 2020 - memory.h is at /usr/include AND in /usr/include/c++/4.8.5 and you need the second to be found before the first.所以这里我在 2020 年学到的 - memory.h 位于 /usr/include AND 位于 /usr/include/c++/4.8.5 中,您需要在第一个之前找到第二个。 In Eclipse set the order using Project->Properties->Path and Symbols->Includes->Add... path if needed and set first
在 Eclipse 中使用 Project->Properties->Path 和 Symbols->Includes->Add... 路径设置顺序,如果需要并首先设置
您需要包含 #include 来解决问题,至少在我的 ubunto linux 机器上
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