如何让 g++ 使用移动构造函数编译 c++11 代码？
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How do I get g++ to compile c++11 code with a move constructor?
提问by Collin
I can't seem to get g++ to compile c++11 code that uses a move constructor. I keep getting this error:
我似乎无法让 g++ 编译使用移动构造函数的 c++11 代码。我不断收到此错误：
collin@Serenity:~/Projects/arraylib$ g++ ./t2.cpp
./t2.cpp:10:27: error: expected ‘,' or ‘...' before ‘&&' token
./t2.cpp:10:38: error: invalid constructor; you probably meant ‘Blarg (const Blarg&)'
The program I am writing is quite different from this, but I trimmed it down to the part that seems like it should definitely work, yet still triggers the error:
我正在编写的程序与此完全不同，但我将其修剪为看起来肯定可以工作的部分，但仍然会触发错误：
#include <iostream>
using namespace std;
class Blarg {
public:
Blarg () {};
Blarg (const Blarg& original) {}; /* Copy constructor */
Blarg (Blarg&& original) {}; /* Move constructor */
};
int main(int argc, char *argv[])
{
Blarg b;
return 0;
}
Can anyone tell me what I am doing wrong? Rather, how to fix it?
谁能告诉我我做错了什么？相反，如何修复它？
This is my gcc version:
这是我的 gcc 版本：
gcc (Ubuntu/Linaro 4.6.2-14ubuntu2) 4.6.2
回答by Kerrek SB
Say g++ -std=c++0x ./t2.cpp.
说g++ -std=c++0x ./t2.cpp。
While you're at it, you might as well Do It Right and enable all warnings:
当你在做的时候，你也可以正确地做并启用所有警告：
g++ -W -Wall -Wextra -pedantic -std=c++0x -o t2 t2.cpp
You really, really shouldn't be compiling with any less, especiallyif you are going to ask questions about your code on SO :-) Various optimization flags should optionally be considered for the release version, such as -s -O2 -flto -march=native.
你真的，真的不应该编译更少，特别是如果你要在 SO 上询问关于你的代码的问题:-) 应该选择为发布版本考虑各种优化标志，例如-s -O2 -flto -march=native.
回答by Willem Hengeveld
You probably forgot to add -std=c++0xto your commandline.
您可能忘记添加-std=c++0x到命令行。
