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struct初始化

摘自：

The field identifiers are indeed C initializer syntax. In C++ just give the values in the correct order without the field names. Unfortunately this means you need to give them all (actually you can omit trailing zero-valued fields and the result will be the same).

在C++中初始化struct不需要寫出各field的名字，只需要確保各值的順序與field在struct中的順序一致就行。

在getopt.h中定義了struct option：

struct option {
       const char *name;    int         has_arg;    int        *flag;    int         val;};

在TensorRT/samples/common/argsParser.h中，對struct option型別的變數進行初始化：

static struct option long_options[] = {
   {
   "help", no_argument, 0, 'h'}, {
   "datadir", required_argument, 0, 'd'},            {
   "int8", no_argument, 0, 'i'}, {
   "fp16", no_argument, 0, 'f'}, {
   "useILoop", no_argument, 0, 'l'},            {
   "useDLACore", required_argument, 0, 'u'}, {
   "batch", required_argument, 0, 'b'}, {
   nullptr, 0, nullptr, 0}};

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