C/C++ 对于数组,有什么比较好的赋值方式? - V2EX
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alphaprogrammer
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C/C++ 对于数组,有什么比较好的赋值方式?

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  •   alphaprogrammer May 31, 2019 4409 views
    This topic created in 2525 days ago, the information mentioned may be changed or developed.
    9 replies    2019-06-03 08:02:02 +08:00
    FlVE
        1
    FlVE  
       May 31, 2019
    cblas_zcopy()
    alphaprogrammer
        2
    alphaprogrammer  
    OP
       May 31, 2019
    @FlVE memory copy ?
    missdeer
        3
    missdeer  
       May 31, 2019
    initializer list ?
    alphaprogrammer
        4
    alphaprogrammer  
    OP
       May 31, 2019
    @missdeer 有一个 default 数组,程序运行时会从配置文件中 load,如果配置文件没有这个值,才会赋值为 default 数组,
    secondwtq
        5
    secondwtq  
       May 31, 2019
    用 std::array
    GeminiPro
        6
    GeminiPro  
       May 31, 2019
    emplace_back()
    Akiyu
        7
    Akiyu  
       May 31, 2019
    我所知的一种是使用标准库的 array 模板
    因为它同时是模板, 所以还支持一些列的模板函数和操作

    二种是使用 memcopy
    这种直接内存拷贝的函数对于连续的数据结构都挺好用的

    顺便, c++ 之所以是 c 的超集, 除了面向对象的特性外
    还有标准库, 模板, 这些东西, 所以, c++ 里面最好使用 vector
    vector 经过高度优化, 其带来的方便和可伸缩性已足以弥补性能的额外消耗
    AlohaV2
        8
    AlohaV2  
       Jun 1, 2019
    提这种问题最好说一下使用场景,没有通用的最好方法
    xuddk727
        9
    xuddk727  
       Jun 3, 2019
    如果是只赋一个任意初值,memset 也行。
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