鉴于我将一个vector
整数写入未格式化的临时文件:
ofstream foo("foo.txt", ios::binary);
const auto length= size(output);
foo.write(reinterpret_cast<const char*>(length), sizeof(length));
if(!empty(input)) foo.write(reinterpret_cast<const char*>(data(output)), sizeof(decltype(output)::value_type) * length);
我可以稍后从与以下input
类型相同的文件中进行以下格式化读取output
:
ifstream foo("foo.txt", ios::binary);
size_t size;
foo.read(reinterpret_cast<char*>(size), sizeof(size));
input.resize(size);
if(!empty(input)) copy(istream_iterator<decltype(output)::value_type>(foo), istream_iterator<decltype(output)::value_type>(), begin(input));