在 C++ 中初始化对数组
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Initializing an array of pair in C++
提问by user1465557
I want to initialize an array of pair in the following way:
我想通过以下方式初始化一对数组：
pair<int, int> adjs[4] = {{current_node.first-1, current_node.second}, {current_node.first+1, current_node.second}, {current_node.first, current_node.second-1}, {current_node.first, current_node.second+1}};
However my compiler, Code::Blocks 12.1, keeps on throwing the error:
但是，我的编译器 Code::Blocks 12.1 不断抛出错误：
brace-enclosed initializer used to initialize `std::pair<int, int>'|
I used this method once before on an online compiler and it worked. So is it the problem with the compiler or some syntax issue in my code? I don't want to initialize 4 pair one by one. Suggest a way in which I can get rid of this error.
我之前在一个在线编译器上使用过这种方法并且它有效。那么是编译器的问题还是我的代码中的某些语法问题？我不想一一初始化 4 对。建议我可以摆脱这个错误的方法。
回答by mattnewport
This universal initialization syntax is a C++11 feature, likely the compiler you are using does not support C++11 but the online one did.
这种通用的初始化语法是 C++11 的一个特性，可能你使用的编译器不支持 C++11，但在线编译器支持。
You can initialize your array like this instead:
您可以像这样初始化数组：
pair<int, int> adjs[4] = {make_pair(current_node.first-1, current_node.second), ...};
A live example: http://ideone.com/ggpGX9
一个活生生的例子：http: //ideone.com/ggpGX9
