C++:将char插入字符串

Question

所以我试图将从字符串中获取的字符插入另一个字符串.在这里,我的行动:1.我想使用简单:

someString.insert(somePosition, myChar);

2.我收到错误,因为insert需要(在我的情况下)char*或string
3.我通过stringstream将char转换为char*:

stringstream conversion;
char* myCharInsert;
conversion << myChar //That is actually someAnotherString.at(someOtherPosition) if that matters;
conversion >> myCharInsert;
someString.insert(somePosition, myCharInsert);

一切似乎都在成功编译,但程序崩溃了

conversion >> myCharInsert;

线.

5.我正在尝试用字符串替换char*:

stringstream conversion;
char* myCharInsert;
conversion << myChar //That is actually someAnotherString.at(someOtherPosition) if that matters;
conversion >> myCharInsert;
someString.insert(somePosition, myCharInsert);

一切似乎都没问题,但是当它someAnotherString.at(someOtherPosition)变成空间时,程序会崩溃.

那么我该怎么做呢？

Answer 1

有许多重载std::string::insert.插入单个字符的重载实际上有三个参数:

string& insert(size_type pos, size_type n, char c);

第二个参数,n是c在位置插入字符串pos的次数(即重复字符的次数.如果您只想插入一个字符实例,只需将其传递一个,例如,

someString.insert(somePosition, 1, myChar);