blocks|key|3946771|text|在c%2B%2B中，建议对固定大小数组使用std::array，对动态大小数组使用std::vector。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3946772|它们都可以通过引用传递，由函数修改。这要求函数声明该参数是通过引用使用&符号传递的。|BOLD|3946773|参见下面的示例：|3946774|#include+<array>
#include+<vector>

//+Get+an+array+(with+a+fixed+size+of+3)+by+refernce+and+modify+it:
void+ModifyStdArray(std::array<int,+3>+&+a)+{
++++a+=+std::array<int,+3>{8,+9,+10};
++++//+or:
++++a[0]+=+8;
++++a[1]+=+9;
++++//+etc.
}

//+Get+a+vector+by+refernce+and+modify+it:
void+ModifyStdVector(std::vector<int>+&+v)+{
++++v+=+std::vector<int>{+1,2,3,4+};
++++//+or:
++++v.clear();
++++v.push_back(1);
++++v.push_back(2);
++++//+etc.
}

int+main()
{
++++std::array<int,+3>+a1;
++++//+Pass+a1+by+reference:
++++ModifyStdArray(a1);
++++//+Here+a1+will+be+modified.

++++std::vector<int>+v1;
++++//+Pass+v1+by+reference:
++++ModifyStdVector(v1);
++++//+Here+v1+will+be+modified.
}|code-block|syntax|javascript|3946775|entityMap^0|H|A|11|B|0|N|A|Z|1|0|0|8|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|W|8|@$9|X|A|Y|B|H]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|I|3|J|5|6|7|11|8|@$9|12|A|13|B|H]]|D|@]|E|$]]|$1|K|3|L|5|M|7|14|8|@]|D|@]|E|$N|O]]|$1|P|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|Q|$]]

In c++ it is recomended to use <code>std::array</code> for fixed size arrays, and <code>std::vector</code> for a dynamic size arrays.
Both of them can be passed by refernce, to be modified by a function.
This requires the function to declare that the argument is passed by refernce using the <code>&amp;</code> symbol.
See the example below:
<pre><code>#include &lt;array&gt;
#include &lt;vector&gt;

// Get an array (with a fixed size of 3) by refernce and modify it:
void ModifyStdArray(std::array&lt;int, 3&gt; &amp; a) {
 a = std::array&lt;int, 3&gt;{8, 9, 10};
 // or:
 a[0] = 8;
 a[1] = 9;
 // etc.
}

// Get a vector by refernce and modify it:
void ModifyStdVector(std::vector&lt;int&gt; &amp; v) {
 v = std::vector&lt;int&gt;{ 1,2,3,4 };
 // or:
 v.clear();
 v.push_back(1);
 v.push_back(2);
 // etc.
}

int main()
{
 std::array&lt;int, 3&gt; a1;
 // Pass a1 by reference:
 ModifyStdArray(a1);
 // Here a1 will be modified.

 std::vector&lt;int&gt; v1;
 // Pass v1 by reference:
 ModifyStdVector(v1);
 // Here v1 will be modified.
}
</code></pre>

blocks|key|4040882|text|你可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4040883|#include+<iostream>
#include+<array>
#include+<algorithm>

//+with+std::array
void+byReference(+std::array<int,+3>&+p+)
{
++++const+std::array<int,+3>+q+{+8,+9,+10+};
++++std::copy_n(+std::begin(+q+),+std::size(+p+),+std::begin(+p+)+);+//+copy+q+to+p
}

//+with+C-style+arrays
void+byReference(+int+(&p)[+3+]+)
{
++++const+int+q[+3+]+{+8,+9,+10+};
++++std::copy_n(+std::begin(+q+),+std::size(+p+),+std::begin(+p+)+);+//+copy+q+to+p
}


int+main(+)
{
++++std::array<int,+3>+arr;
++++//+int+arr[+3+];+//+or+this+one

++++byReference(+arr+);

++++std::cout+<<+"The+array+is:+";
++++std::copy_n(+std::begin(+arr+),+std::size(+arr+),
+++++++++++++++++std::ostream_iterator<int>(+std::cout,+"+"+)+);+//+copy+the+elements+of+arr+to
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++//+the+stdout+(aka+print+them)
++++std::cout+<<+'\n';
}|code-block|syntax|javascript|4040884|输出：|4040885|The+array+is:+8+9+10+|4040886|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You can do it like this:
<pre><code>#include &lt;iostream&gt;
#include &lt;array&gt;
#include &lt;algorithm&gt;

// with std::array
void byReference( std::array&lt;int, 3&gt;&amp; p )
{
 const std::array&lt;int, 3&gt; q { 8, 9, 10 };
 std::copy_n( std::begin( q ), std::size( p ), std::begin( p ) ); // copy q to p
}

// with C-style arrays
void byReference( int (&amp;p)[ 3 ] )
{
 const int q[ 3 ] { 8, 9, 10 };
 std::copy_n( std::begin( q ), std::size( p ), std::begin( p ) ); // copy q to p
}


int main( )
{
 std::array&lt;int, 3&gt; arr;
 // int arr[ 3 ]; // or this one

 byReference( arr );

 std::cout &lt;&lt; &quot;The array is: &quot;;
 std::copy_n( std::begin( arr ), std::size( arr ),
 std::ostream_iterator&lt;int&gt;( std::cout, &quot; &quot; ) ); // copy the elements of arr to
 // the stdout (aka print them)
 std::cout &lt;&lt; '\n';
}
</code></pre>
Output:
<pre><code>The array is: 8 9 10 
</code></pre>

blocks|key|3509833|text|不能通过赋值复制数组。您可以使用std::copy|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3509834|void+byReference(int(&p)[3])+{
++++int+q[3]+=+{+8,+9,+10+};
++//++p+=+q;
++++std::copy(&q[0],+&q[3],+&p[0]);
}|code-block|syntax|javascript|3509835|……|3509836|int+a[3]+=+{+1,+2,+3+};
byReference(a);

//+a+now+8,9,10|3509837|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You cannot copy arrays by assignment. You can use std::copy
<pre><code>void byReference(int(&amp;p)[3]) {
 int q[3] = { 8, 9, 10 };
 // p = q;
 std::copy(&amp;q[0], &amp;q[3], &amp;p[0]);
}
</code></pre>
....
<pre><code>int a[3] = { 1, 2, 3 };
byReference(a);

// a now 8,9,10
</code></pre>

<pre><code>void byReference(int (&amp;p)[3]){
 int q[3] = {8, 9, 10};
 p = q;
}

</code></pre>
I want to write function where i can reassign the p with new array. I am not sure if we can do that.
My goal :
i want to change the original array, like we do swapping of two number by call-by reference.
Edit:
my working solution :
<pre><code>void byReference(int*&amp; p){
 int* q = new int[2];
 q[0] = 8;
 q[1] = 9;
 
 p = q;
}

int main(){
 int *x = new int[2];
 x[0] = 1;
 x[1] = 2;

 byReference(x);
 
 return 0;
}
</code></pre>

assigning new array to reference variable

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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void byReference(int (&p)[3]){    int q[3] = {8, 9, 10};    p = q;}我想编写函数，在那里我可以用新数组重新分配p。我不确定我们是否能做到。我的目标:我想改变原来的数组，就像我们通过调用通过引用交换两个数字一样。编辑：我的工作解决方案：void byRef...

问将新数组分配给引用变量
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