c++ - boost mapped_file_source 抛出什么异常？

Question

Boost mapped_file_source 似乎会抛出异常，例如文件未找到。它到底抛出了哪些异常类？文档中似乎没有说明，除非我遗漏了什么。

编辑:测试用例:

#include <boost/iostreams/device/mapped_file.hpp>

int main(int argc, char** argv) {
    boost::iostreams::mapped_file_source file;
    file.open(argv[1]);
    return 0;
}

Answer 1

如果映射失败，代码

mapped_handle_ = 
        ::CreateFileMappingA( 
            handle_, 
            NULL,
            protect,
            0, 
            0, 
            NULL );
    if (mapped_handle_ == NULL)
        cleanup_and_throw("failed create mapping");

最终会抛出一个

boost::iostreams::detail::throw_system_failure(msg);

即std::exception 的子类。在这种情况下，它应该是 std::ios::failure:

BOOST_IOSTREAMS_FAILURE

Expands to std::ios_base::failure if available, and to a suitable derived class of std::exception otherwise.

引用:http://www.boost.org/doc/libs/1_41_0/libs/iostreams/src/mapped_file.cpp