[英]Struct destructor called implicitly - is my syntax wrong?
In the following code, the destructor of the struct FileWrapper
is called by the program without me explicitly asking for it. 在下面的代码中,程序不调用结构
FileWrapper
的析构函数,而无需我明确要求它。 How can I prevent this? 我该如何预防?
struct FileWrapper {
std::fstream* capture_file;
std::string filename;
FileWrapper(std::string _filename = "./capture.dat", bool overwrite = true) {
filename = _filename;
std::ios_base::openmode mode = std::fstream::binary | std::fstream::in | std::fstream::out | std::fstream::trunc;
capture_file = new std::fstream(filename, mode);
if (!capture_file->is_open()) {
std::cout << "Could not open capture file.\n";
}
}
void close() {
std::cout << "closing file.\n";
capture_file->close();
}
~FileWrapper() {
close();
}
};
void test_file_open() {
FileWrapper fw = FileWrapper("./fw-capture.dat");
//Odd behaviour: fw destructor called before or during the following line
if (!fw.capture_file->is_open()) {
std::cout << "File Wrapper's capture file is not open.\n";
} else {
std::cout << "File Wrapper's capture file IS open.\n";
}
}
Just do this 做这个
void test_file_open() {
FileWrapper fw("./fw-capture.dat");
You are creating an extra object. 您正在创建一个额外的对象。
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