C ++和boost program_options错误:"desc"未命名类型 [英] c++ and boost program_options error: 'desc' does not name a type

问题描述

我正在尝试遵循有关增强本教程的内容program_options ，但出现此错误:

I'm trying to follow this tutorial on boost program_options, but I'm getting this error:

错误:"desc"未命名类型.

error: 'desc' does not name a type.

这是我拥有的源代码:

#include <boost/program_options.hpp>

using namespace std;

namespace po = boost::program_options;

po::options_description desc("Allowed options");
desc.add_options()
    ("help", "produce help message")
    ("compression", po::value<int>(), "set compression level")
;

int main()
{
    return 0;
}

错误出现在以'desc.add_options'开头的行上，而不是我构造错误的行上.

the error is on the line starting with 'desc.add_options', not the line where I construct it.

/usr/local/boost是我的BOOST_ROOT，我已将其添加到我的代码块编译器设置中.编译器arg是-I/usr/local/boost

/usr/local/boost is my BOOST_ROOT, and I have it added to my code blocks compiler settings. The compiler arg is -I/usr/local/boost

为什么这不起作用?

推荐答案

看起来像您尝试使用这些行

Looks like you try to use the lines

po::options_description desc("Allowed options");
desc.add_options()

在所有功能之外的顶层.在C ++中，此方法不起作用-将代码移至函数中.

on top level outside of all functions. In C++ this does not work - move this code to a function.

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