C++ 如何初始化指针向量
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原文地址: http://stackoverflow.com/questions/9090680/
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How to initialize a vector of pointers
提问by Joshua Vaughan
I am working on a C++ program, and I need to initialize a vector of pointers. I know how to initialize a vector, but if someone could show me how to initialize it as a vector filled with pointers that would be great!
我正在开发一个 C++ 程序，我需要初始化一个指针向量。我知道如何初始化一个向量，但是如果有人能告诉我如何将它初始化为一个充满指针的向量，那就太好了！
回答by Ben Voigt
A zero-size vector of pointers:
一个零大小的指针向量：
std::vector<int*> empty;
A vector of NULL pointers:
空指针向量：
std::vector<int*> nulled(10);
A vector of pointers to newly allocated objects (not really initialization though):
指向新分配对象的指针向量（虽然不是真正的初始化）：
std::vector<int*> stuff;
stuff.reserve(10);
for( int i = 0; i < 10; ++i )
stuff.push_back(new int(i));
Initializing a vector of pointers to newly allocated objects (needs C++11):
初始化指向新分配对象的指针向量（需要 C++11）：
std::vector<int*> widgets{ new int(0), new int(1), new int(17) };
A smarter version of #3:
#3 的更智能版本：
std::vector<std::unique_ptr<int>> stuff;
stuff.reserve(10);
for( int i = 0; i < 10; ++i )
stuff.emplace_back(new int(i));
