{}的作用域

{}内声明的变量，只在{}内有效。

  uint8_t* in；   std::unique_ptr<uint8_t[]> imgdata；

  if(1)   {     /***********************************decode jpg*****************************************/

    tensorflow::Env* env = tensorflow::Env::Default();     string jpeg;     ReadFileToStringOrDie(env, s->input_file_name, &jpeg);     const int fsize = jpeg.size();     //printf("fsize = %d\n",fsize);     const uint8* const image_buffer = tensorflow::bit_cast<const uint8_t*>(jpeg.data());       // Try partial decoding (half of the data)     int w, h, c;     //std::unique_ptr<uint8_t[]> imgdata;     tensorflow::jpeg::UncompressFlags flags;     flags.components = 3;       flags.min_acceptable_fraction = 1.0;     imgdata.reset(tensorflow::jpeg::Uncompress(image_buffer, fsize, flags, &w, &h, &c, nullptr));     CHECK(imgdata != nullptr);     image_width = w;     image_height = h;     in = imgdata.get();         printf("image_width = %d\n", image_width);     printf("image_height = %d\n", image_height);     /***********************************decode jpg*****************************************/       }

以上代码的运行结果是正确的。

  uint8_t* in;

  if(1)   {     /***********************************decode jpg*****************************************/

    tensorflow::Env* env = tensorflow::Env::Default();     string jpeg;     ReadFileToStringOrDie(env, s->input_file_name, &jpeg);     const int fsize = jpeg.size();     //printf("fsize = %d\n",fsize);     const uint8* const image_buffer = tensorflow::bit_cast<const uint8_t*>(jpeg.data());       // Try partial decoding (half of the data)     int w, h, c;     //std::unique_ptr<uint8_t[]> imgdata;     tensorflow::jpeg::UncompressFlags flags;     flags.components = 3;

std::unique_ptr<uint8_t[]> imgdata；//<-------这里有问题     flags.min_acceptable_fraction = 1.0;     imgdata.reset(tensorflow::jpeg::Uncompress(image_buffer, fsize, flags, &w, &h, &c, nullptr));     CHECK(imgdata != nullptr);     image_width = w;     image_height = h;     in = imgdata.get();         printf("image_width = %d\n", image_width);     printf("image_height = %d\n", image_height);     /***********************************decode jpg*****************************************/       }

以上代码的而结果是错误的