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概述
std::basic_string::c_str
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const CharT* c_str() const;
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Returns a pointer to a null-terminated character array with data equivalent to those stored in the string.
The pointer is such that the range [c_str(); c_str() + size()] is valid and the values in it correspond to the values stored in the string with an additional null character after the last position.
The pointer obtained from c_str() may be invalidated by:
- Passing a non-const reference to the string to any standard library function, or
- Calling non-const member functions on the string, excluding operator[], at(), front(), back(), begin(),rbegin(), end() and rend().
Writing to the character array accessed through c_str() is undefined behavior.
c_str() and data() perform the same function. | (since C++11) |
这里：
用c_str() 方法可以返回一个指向C-风格的字符串的指针。
如:
string filename;
cout << "Enter the file name: ":
cin >> filename;
ofstream fout;
fout.open(filename.c_str());最后
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