我需要解析一些INI文件。为此,我尝试使用boost::property_tree
,但在我的系统中不允许使用例外。
使用boost::property_tree
时如何禁用异常支持?
如果无法做到这一点,我们非常感谢您对其他图书馆的任何建议。
在@sehe的回答之后,我尝试了这段代码,但没有成功:
#include <iostream>
#include <string>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/ini_parser.hpp>
namespace boost {
void throw_exception(std::exception const& e) {
std::cerr << "Fake exception: " << e.what() << "\n";
std::exit(255);
}
}
class Foo {
public:
bool bar(const std::string file_name) {
boost::property_tree::ptree prop_tree;
boost::property_tree::read_ini(file_name, prop_tree);
return !prop_tree.empty();
}
};
编译行代码使用以下参数:
-c -DBOOST_USER_CONFIG="<user.hpp>" -DBOOST_NO_EXCEPTIONS -DBOOST_EXCEPTION_DISABLE -I.\toolchain\boost -I.\include Foo.cpp
最后,user.hpp
文件:
#define BOOST_HAS_NRVO
#define BOOST_NO_COMPLETE_VALUE_INITIALIZATION
#define BOOST_NO_CXX11_AUTO_DECLARATIONS
#define BOOST_NO_CXX11_AUTO_MULTIDECLARATIONS
#define BOOST_NO_CXX11_CHAR16_T
#define BOOST_NO_CXX11_CHAR32_T
#define BOOST_NO_CXX11_CONSTEXPR
#define BOOST_NO_CXX11_DECLTYPE
#define BOOST_NO_CXX11_DECLTYPE_N3276
#define BOOST_NO_CXX11_DEFAULTED_FUNCTIONS
#define BOOST_NO_CXX11_DELETED_FUNCTIONS
#define BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS
#define BOOST_NO_CXX11_FINAL
#define BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS
#define BOOST_NO_CXX11_LAMBDAS
#define BOOST_NO_CXX11_LOCAL_CLASS_TEMPLATE_PARAMETERS
#define BOOST_NO_CXX11_NOEXCEPT
#define BOOST_NO_CXX11_NULLPTR
#define BOOST_NO_CXX11_RANGE_BASED_FOR
#define BOOST_NO_CXX11_RAW_LITERALS
#define BOOST_NO_CXX11_REF_QUALIFIERS
#define BOOST_NO_CXX11_RVALUE_REFERENCES
#define BOOST_NO_CXX11_SCOPED_ENUMS
#define BOOST_NO_CXX11_STATIC_ASSERT
#define BOOST_NO_CXX11_TEMPLATE_ALIASES
#define BOOST_NO_CXX11_UNICODE_LITERALS
#define BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
#define BOOST_NO_CXX11_USER_DEFINED_LITERALS
#define BOOST_NO_CXX11_VARIADIC_MACROS
#define BOOST_NO_CXX11_VARIADIC_TEMPLATES
#define BOOST_NO_SFINAE_EXPR
#define BOOST_NO_TWO_PHASE_NAME_LOOKUP
编译器返回的一些错误:
"boost/optional/optional.hpp", line 1047: Error: #312: no suitable user-defined conversion from "boost::bad_optional_access" to "const std::exception" exists
throw_exception(bad_optional_access());
^
"boost/property_tree/string_path.hpp", line 221: Error: #312: no suitable user-defined conversion from "boost::property_tree::ptree_bad_path" to "const std::exception" exists
BOOST_PROPERTY_TREE_THROW(ptree_bad_path("Path syntax error", *this));
^
"boost/property_tree/detail/ptree_implementation.hpp", line 78: Error: #742: namespace "boost" has no actual member "iterator_core_access"
friend class boost::iterator_core_access;
^
PS:我没有使用广泛使用的标准编译器,但它使用上述相同的过程成功编译了boost::smart_ptr
。
答案 0 :(得分:2)
您可以将Boost Exception配置为不使用例外:
您需要定义BOOST_NO_EXCEPTIONS
并进一步实现您自己的C风格异常处理功能,例如
void throw_exception(std::exception const& e) {
std::cerr << "Fake exception: " << e.what() << "\n";
std::exit(255);
}
<强> Live On Coliru 强>
#define BOOST_NO_EXCEPTIONS
#include <iostream>
#include <boost/property_tree/ini_parser.hpp>
namespace boost {
void throw_exception(std::exception const& e) {
std::cerr << "Fake exception: " << e.what() << "\n";
std::exit(255);
}
}
using namespace boost::property_tree;
int main() {
ptree pt;
read_ini(std::cin, pt);
write_ini(std::cout, pt.get_child("section5"));
}
编译
g++ -std=c++11 -O3 -Wall -pedantic main.cpp -fno-exceptions
打印
./test <<< "[section1]"
Fake exception: No such node (section5)