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    <p>There are three ways to pass arguments: <strong>by value</strong>, <strong>with pointers</strong>, and <strong>by reference</strong>.</p> <p><strong>By value</strong>: A new copy of the argument will be created. For big objects like <code>std::string</code> this could be expensive. For small things like <code>int</code>, it doesn't matter.</p> <pre><code>void myFunc(std::string str) { ... } std::string mySuperLongString = getSuperLongString() myFunc(mySuperLongString) // will make a copy of the long string. Expensive. </code></pre> <p><strong>With pointers</strong>: When passing a pointer, you're just passing the address of a piece of data. Really, the pointer is passed by value, but because you're just passing an address, it's a light operation.</p> <pre><code>void myFunc(std::string *str) { ... } std::string mySuperLongString = getSuperLongString() myFunc(&amp;mySuperLongString) // Pass the address of the string. Light operation </code></pre> <p><strong>With references</strong>: It's very similar to using pointers except that you have some extra safety checks. For example, you can't reassign a reference after assigning it once, and you can treat a reference as simply another name for the thing you're working with (i.e. you don't need to use the dereference operators <code>*</code> and <code>-&gt;</code> like with pointers). Using references is <em>just as lightweight as using pointers</em>, but safer. This is the preferred way of passing arguments C++.</p> <pre><code>void myFunc(std::string&amp; str) { ... } std::string mySuperLongString = getSuperLongString() myFunc(mySuperLongString) // Pass a reference to the string. Light operation </code></pre>
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    1. POBest way to use c++ pointer?
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    1. USAri
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    1. COThank for this information ! :)
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