windows - C++ CopyConstructor 引发的异常！！-PHP中文网问答

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windows - C++ CopyConstructor 引发的异常！！

过去多啦不再A梦 2017-05-31 10:39:26

774

代码如下:

void CopyStr(char *&destination, char *&source) { int sz = strlen(source) + 1;//此处引发异常！！ destination = new char[sz]; for (unsigned i = 0; source[i] != 'rrreee'; i++) destination[i] = source[i]; destination[sz - 1] = 'rrreee'; return; } Data::Data(Data &adata) { CopyStr(adata.P_name, P_name); CopyStr(adata.address, address); CopyStr(adata.number, number); }

代码说明:Data类现在有三个char*成员,分别是P_name,address和number。

编译图片:

求大神解答，谢谢！！

过去多啦不再A梦

全部回复 (3)

伊谢尔伦2017-05-31 10:41:26 3 楼

首先char *&source这种参数改为char *const &source，其次CopyStr(adata.P_name, P_name),这种改为CopyStr(P_name, adata.P_name)。
这是我测试的代码，直接可以运行：

#include  #include  using std::cout; using std::endl; using std::strlen; class Data { public: char *a = ""; char *b = ""; char *c = ""; Data(char *a, char *b, char *c):a(a),b(b),c(c) {}; Data(Data const &data); }; int CopyStr(char * &des, char * const &source) { int sz = strlen(source) + 1; des = new char(sz); for (unsigned i = 0; source[i] != 'rrreee'; i++) *(des +i) = source[i]; *(des+sz - 1) = 'rrreee'; return 0; } Data::Data(Data const &data) { CopyStr(a, data.a); CopyStr(b, data.b); CopyStr(c, data.c); } int main() { Data data = Data("abcd", "b", "c"); char * p = "232323"; Data data2 = Data(data); char * p2 = "1232"; CopyStr(p2, p); cout << p2 << endl; cout << data.a << endl; cout << data2.a << endl; return 0; }