为什么我在运行 Boost 代码时总是收到警告？

Question

我注意到当我从 Boost 网站运行代码示例时收到大量警告。比如这个程序：

#include <cassert>
#include <string>
#include <boost/iostreams/device/back_inserter.hpp>
#include <boost/iostreams/filtering_stream.hpp>

namespace io = boost::iostreams;

int main()
{
    using namespace std;

    string                 result;
    io::filtering_ostream  out(io::back_inserter(result));
    out << "Hello World!";
    out.flush();
    std::cout << result;
}

这些是我得到的警告（我已经取出了大部分的血和内脏）：

warning: declaration of 'close' shadows a member of 'this' [-Wshadow]
warning: declaration of 'ptr' shadows a member of 'this' [-Wshadow]
warning: declaration of 'close' shadows a member of 'this' [-Wshadow]
warning: declaration of 'next' shadows a member of 'this' [-Wshadow]
warning: declaration of 'component_type' shadows a member of 'this' [-Wshadow]
warning: declaration of 'close' shadows a member of 'this' [-Wshadow]
warning: declaration of 'component_type' shadows a member of 'this' [-Wshadow]
warning: declaration of 'next' shadows a member of 'this' [-Wshadow]
warning: declaration of 'close' shadows a member of 'this' [-Wshadow]
warning: declaration of 'next' shadows a member of 'this' [-Wshadow]
warning: declaration of 'close' shadows a member of 'this' [-Wshadow]

为什么会这样？有没有可能是我在安装 Boost 时做错了什么？

Answer 1

这可能只是意味着编译器实施了更严格的警告。

如果您的编译器版本/平台受支持，上游将（通常）修复这些编译器的代码。

您通常可以通过执行以下操作来隐藏系统标头的警告：

-isystem /path/to/boost

（即代替-I /path/to/boost）

Answer 2

不只是你。其他人也有reported这个问题。不过你的代码很好。