std::vector<bool> binary_vec;
时间: 2024-01-22 12:03:57 浏览: 31
这是一个定义了名为 `binary_vec` 的空的 `std::vector` 对象,它的元素类型是 `bool`,也就是布尔类型。 `std::vector` 是 C++ 标准库中的一个容器类,它可以存储一系列同种类型的元素,并且支持动态调整大小、随机访问、插入和删除等操作。在这里,`std::vector<bool>` 是一个特化版本,它进行了一些优化以节省内存空间,但同时也牺牲了一些标准 `std::vector` 的功能。由于 `std::vector<bool>` 的实现方式与其他标准容器类不同,因此在使用时需要注意一些细节。
相关问题
std::vector<BOOL>
std::vector<bool> 是C++标准库中的容器类,用于存储布尔类型的元素。它的底层实现是通过使用std::_Bvector_impl_data和std::_Bvector_impl这两个类来记录底层内存使用情况和实现容器的核心功能。其中,std::_Bvector_base是std::vector<bool>的基类,用于实现迭代器和一些相关功能。在std::vector<bool>中,基本存储单位是std::_Bit_reference,而不是bool类型。因此,当我们使用std::vector<bool>的operator[]函数时,返回的是std::_Bit_reference类型的对象。<em>1</em><em>2</em><em>3</em>
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- *1* *2* *3* [C++语法学习笔记之三 -- 源码分析 std::vector<bool> 设计,学会合理使用](https://blog.csdn.net/zhongyunde/article/details/117394574)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT0_1"}} ] [.reference_item]
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std::vector<bool>
std::vector<bool> is a specialization of the std::vector template class in C++ that is optimized for storing boolean values. Unlike the standard std::vector template class, which stores elements as contiguous blocks of memory, std::vector<bool> stores each boolean value as a single bit, packing multiple bits into a single byte.
This optimization allows std::vector<bool> to use less memory than a regular std::vector when storing large numbers of boolean values. However, it also introduces some complexity when accessing individual elements, as each boolean value must be extracted from its packed bit representation.
To make accessing individual elements easier, std::vector<bool> provides a specialized proxy class called std::vector<bool>::reference. This class acts like a boolean reference, but internally it works by manipulating the packed bit representation of the boolean value.
Overall, std::vector<bool> can be a useful tool for storing large numbers of boolean values in a memory-efficient manner, but it may also require some additional care and attention when accessing individual elements.