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POWhy the memory allocation like this when the const reference release to a different type in g++4.7.3
 

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  1. POWhy the memory allocation like this when the const reference release to a different type in g++4.7.3
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    <p>My compiler is g++ 4.7.3</p> <pre><code>long i = 2222; const long&amp; lref = i; const int&amp; iref = i; printf("i=%p lref=%p iref=%p \n", &amp;i , &amp;lref, &amp;iref); </code></pre> <p>The result is </p> <pre><code>i=0xbfd78760 lref=0xbfd78760 iref=0xbfd78764 </code></pre> <p>Why the address of <code>iref</code> is higher than <code>i</code></p> <p>I think it may just like this: when <code>const int&amp;</code> reference to <code>long</code>, it like </p> <pre><code>int temp = i const int&amp; iref = temp; </code></pre> <p>==========================================================</p> <p>CODE2</p> <p>However when the code like </p> <pre><code>long i = 2222; const long&amp; lref = i; const int&amp; iref = i; int a = 10; int b = 10; printf("i=%p lref=%p iref=%p a=%p b=%p\n", &amp;i , &amp;lref, &amp;iref, &amp;a, &amp;b); </code></pre> <p>The result is </p> <pre><code>i=0xbfade768 lref=0xbfade768 iref=0xbfade774 a=0xbfade76c b=0xbfade770 </code></pre> <p>Why the address of <code>a</code> and <code>b</code> is lower than <code>iref</code> in the stack?</p> <p>==========================================================</p> <p>CODE3</p> <p>When the code like </p> <pre><code>long i = 2222; const long&amp; lref = i; const int&amp; iref = i; printf("i=%p lref=%p iref=%p \n", &amp;i , &amp;lref, &amp;iref); </code></pre> <p>The result is </p> <pre><code>i=0xbfbe3f84 lref=0xbfbe3f84 iref=0xbfbe3f83 </code></pre> <p>When the type of <code>iref</code> is <code>char</code>,why the address of <code>iref</code> is lower than <code>i</code>?</p> <p>Can somebody tell my why, thanks you!</p>
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    1. COwhat does it matter at which addresses these variables are?
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    2. COIt may matter if OP is writing low-level and/or embedded code. However, this is definitely not the way to do that.
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    3. COunderstand the memory allocating
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