Viv*_*mar 4 c++ exception-handling
在下面的代码中获取编译器错误,这些代码std::exception 在linux上引入了g ++ 4.8.2.任何有关此错误即将发生的建议将非常有帮助.
#include <iostream>
#include <stdexcept>
void function()
{
std::exception e((char*)"mmmm");
throw e;
}
int main(int argc, const char* arg[]) {
try {
function();
}
catch(const std::exception& e) {
e.what();
}
return 0;
}
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错误:
$ g++ t.cpp
t.cpp: In function ‘void function()’:
t.cpp:6:33: error: no matching function for call to ‘std::exception::exception(char*)’
std::exception e((char*)"mmmm");
^
t.cpp:6:33: note: candidates are:
In file included from /usr/include/c++/4.8/ios:39:0,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from t.cpp:1:
/usr/include/c++/4.8/exception:63:5: note: std::exception::exception()
exception() _GLIBCXX_USE_NOEXCEPT { }
^
/usr/include/c++/4.8/exception:63:5: note: candidate expects 0 arguments, 1 provided
/usr/include/c++/4.8/exception:60:9: note: std::exception::exception(const std::exception&)
class exception
^
/usr/include/c++/4.8/exception:60:9: note: no known conversion for argument 1 from ‘char*’ to ‘const std::exception&’
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编辑1
但是代码在Visual Studio 2010编译器中编译并运行良好.
_EXCEPTION_INLINE __CLR_OR_THIS_CALL exception::exception()
: _Mywhat(NULL), _Mydofree(false) { }
_EXCEPTION_INLINE __CLR_OR_THIS_CALL exception::exception(const char * const & _What)
: _Mywhat(NULL), _Mydofree(false)
{
_Copy_str(_What);
}
_EXCEPTION_INLINE __CLR_OR_THIS_CALL exception::exception(const char * const & _What, int)
: _Mywhat(_What), _Mydofree(false) { }
_EXCEPTION_INLINE __CLR_OR_THIS_CALL exception::exception(const exception& _That)
: _Mywhat(NULL), _Mydofree(false)
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C++标准对此有何看法?
no matching function for call to ...意味着您正在尝试调用一个不存在的函数。std::exception没有采用 achar*或任何可以从 a 转换的构造函数char*。它只有一个默认构造函数和一个复制构造函数。