boost::program_options::options_description 不适用于简化的命令名称

Question

#include <boost/program_options.hpp>
namespace bpo = boost::program_options;

int main(int argc, char* argv[])
{
    int apple_num = 0, orange_num = 0;
    std::vector<std::string> addr;
    bpo::options_description opt("all options");

    opt.add_options()
        ("apple,a", bpo::value<int>(&apple_num)->default_value(10), "apple count")
        ("orange,o", bpo::value<int>(&orange_num)->default_value(20), "orange count")
        ("help", "apple+orange=");

    bpo::variables_map vm;

    try {
        bpo::store(parse_command_line(argc, argv, opt), vm);
    }
    catch (...) {
        std::cout << "error\n";
        return 0;
    }

    bpo::notify(vm);

    if (vm.count("help")) {
        std::cout << opt << std::endl;
        return 0;
    }

    std::cout << "apple count:" << apple_num << std::endl;
    std::cout << "orange count:" << orange_num << std::endl;
    std::cout << "sum:" << orange_num + apple_num << std::endl;
    return 0;
}

它适用于 --apple 或 --orange 的完整命令名称

D:\test\ForTest\Debug> .\ForTest.exe --apple=100 --orange=99
apple count:100
orange count:99
sum:199

但是对于 --a 或 -a 对于简化的 --apple 它失败了，我已经添加了完整的和简化的命令名称“apple,a”。

PS D:\test\ForTest\Debug> .\ForTest.exe -a=99
error
PS D:\test\ForTest\Debug>

为什么？

Answer 1

所选择的命令行样式不期望带有短选项的等号：

./sotest  -a=99
error

但是

./sotest  -a 99
apple count:99
orange count:20
sum:119

修正预期：

auto style = bpo::command_line_style::default_style 
    | bpo::command_line_style::allow_long_disguise
    ;
bpo::store(parse_command_line(argc, argv, opt, style), vm);

现在你得到了

Live On Coliru

+ ./sotest -a 7
apple count:7
orange count:20
sum:27
+ ./sotest -a8
apple count:8
orange count:20
sum:28
+ ./sotest -a=9
apple count:9
orange count:20
sum:29
+ ./sotest --apple=100 --orange=31
apple count:100
orange count:31
sum:131

boost::program_options::options_description 不适用于简化的命令名称

boost::program_options::options_description doesn't work for simplified command name

c++

boost