C + + Array container detailed

An array container, which is a container for storing arrays, is an extension of the Type C array, and can be manipulated using iterators;

For example, "Std::array<int, 5>", it should be noted that if directly assigned, "Std::array<int, 5> ia = {1, 2, 3, 4, 5};"

There will be a warning under gcc: "Missing braces around initializer for ' std::array<int, 5u>::value_type [5] {aka int [5]} ' [-wmissing-bra CES] "

The reason is not in the way of initializing the array, add a group of "{}", such as: "Std::array<int, 5> ia ={{1, 2, 3, 4, 5}};", so that the parameter satisfies the int[5], and then assigns the value;

Arrays are usually assigned in the initialization process, if you want to replace the existing values, one method is to traverse all the values, more complex;

Another method is to reproduce the value by copying to achieve a fast assignment;

Code:

* * * test.cpp * *  Created on:2013.11.12 *      author:caroline
      
//*eclipse CDT; 4.7.1*/
      
#include <iostream>  
#include <array>  
      
int main (void) {  
      
    std::array<int, 5 > ia = {1, 2, 3, 4, 5}};  
    for (const auto I:ia)  
        std::cout << i << "";  
    Std::cout << Std::endl;  
      
    Std::array<int, 5> ia2; Empty array  
    //ia2 = {1, 2, 3, 4, 5};//error  
    IA2 = ia;  
    for (const auto I:IA2)  
        std::cout << i << "";  
    Std::cout << Std::endl;  
      
    return 0;  
}

Author: csdn Blog spike_king

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