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What is_ GLIBCXX_ VISIBILITY(default)

2022-07-29 05:21:00 【AMO Xilin】

In the header file <iostream> Inside , Will see this thing 

#include <bits/c++config.h>
#include <ostream>
#include <istream>

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

......

there _GLIBCXX_VISIBILITY(default) Is a macro

The real appearance looks like this 

__attribute__ ((__visibility__ ("default")))

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