C++ 嵌套boost::variant的分段错误
以下程序已从原始程序缩减。当它运行时,我遇到了一个分段错误。如果我用C++ 嵌套boost::variant的分段错误,c++,boost,boost-spirit,boost-spirit-x3,C++,Boost,Boost Spirit,Boost Spirit X3,以下程序已从原始程序缩减。当它运行时,我遇到了一个分段错误。如果我用算术表达式删除第24行,则程序不再崩溃。如何消除分割错误 #include <boost/config/warning_disable.hpp> #include <boost/spirit/home/x3.hpp> #include <boost/spirit/home/x3/support/ast/variant.hpp> #include <boost/spirit/include
算术表达式
删除第24行,则程序不再崩溃。如何消除分割错误
#include <boost/config/warning_disable.hpp>
#include <boost/spirit/home/x3.hpp>
#include <boost/spirit/home/x3/support/ast/variant.hpp>
#include <boost/spirit/include/qi_expect.hpp>
#include <boost/spirit/home/x3/directive/expect.hpp>
#include <iostream>
#include <string>
namespace wctl_parser {
namespace x3 = boost::spirit::x3;
namespace ascii = x3::ascii;
namespace qi = boost::spirit::qi;
using x3::ulong_;
using x3::lexeme;
//--- Ast structures
struct ArithmeticUnaryExpression;
using AtomicProp = std::string;
using ArithmeticExpression = x3::variant<
x3::forward_ast<ArithmeticUnaryExpression>,
unsigned long
>;
struct ArithmeticUnaryExpression {
std::string op;
ArithmeticExpression operand;
};
using Expression = x3::variant<
ArithmeticExpression
>;
template <typename T> auto rule = [](const char* name = typeid(T).name()) {
struct _{};
return x3::rule<_, T> {name};
};
template <typename T> auto as = [](auto p) { return rule<T>() = p; };
//--- Rules
x3::rule<struct aTrivRule, ArithmeticExpression> aTriv("aTriv");
x3::rule<struct exprRule, Expression> expr("expression");
auto const aTriv_def = rule<ArithmeticExpression>("aTriv")
= ulong_
// | '(' > expr > ')'
;
auto const primitive = rule<Expression>("primitive")
= aTriv
;
auto const expr_def
= primitive
;
BOOST_SPIRIT_DEFINE(aTriv)
BOOST_SPIRIT_DEFINE(expr)
auto const entry = x3::skip(ascii::space) [expr];
} //End namespace
int main() {
std::string str("prop");
namespace x3 = boost::spirit::x3;
wctl_parser::Expression root;
auto iter = str.begin();
auto end = str.end();
bool r = false;
r = parse(iter, end, wctl_parser::entry, root);
if (r) {
std::cout << "Parses OK:" << std::endl << str << std::endl;
if (iter != end) std::cout << "Partial match" << std::endl;
std::cout << std::endl << "----------------------------\n";
}
else {
std::cout << "!! Parsing failed:" << std::endl << str << std::endl << std::endl << "----------------------------\n";
}
return 0;
}
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名称空间wctl_解析器{
名称空间x3=boost::spirit::x3;
名称空间ascii=x3::ascii;
名称空间qi=boost::spirit::qi;
使用x3::ulong_2;;
使用x3::词素;
//---Ast结构
结构算术表达式;
使用AtomicProp=std::string;
使用算术表达式=x3::variant<
x3::向前,
无符号长
>;
结构算术表达式{
std::字符串op;
算术表达式操作数;
};
使用Expression=x3::variant<
算术表达式
>;
模板自动规则=[](常量字符*名称=类型ID(T).name()){
结构{};
返回x3::规则{name};
};
模板auto-as=[](auto p){return rule()=p;};
//---规则
x3::规则aTriv(“aTriv”);
x3::规则表达式(“表达式”);
自动约束定义=规则(“aTriv”)
=乌龙_
//|'('>expr>)'
;
自动常量原语=规则(“原语”)
=心房
;
自动常数表达式
=原语
;
提升精神定义(aTriv)
提升精神定义(expr)
auto const entry=x3::skip(ascii::space)[expr];
}//结束命名空间
int main(){
std::字符串str(“prop”);
名称空间x3=boost::spirit::x3;
wctl_解析器::表达式根;
自动iter=str.begin();
自动结束=str.end();
布尔r=假;
r=parse(iter,end,wctl_parser::entry,root);
if(r){
std::cout您的变体
using ArithmeticExpression = x3::variant<
x3::forward_ast<ArithmeticUnaryExpression>,
unsigned long
>;
using ArithmeticExpression = x3::variant<
unsigned long,
x3::forward_ast<ArithmeticUnaryExpression>
>;