Get size of dynamic pointer in C++
c++
Solution
Simple:
std::vector<byte> buffer;
buffer.resize(1000);
myfile.write(&buffer[0], buffer.size());
Problem
I want to write a dynamic pointer to a file in C++. This is my declaration in header file: ``` byte* buffer; ``` Then in Cpp file, I allocated it: ``` buffer = new byte[1000]; ``` However the size will be bigger than 1000 in dynamic allocation. Then I write to the file: ofstream myfile; ``` myfile.open("test.txt", ios::binary); myfile.write((char*)buffer, 1000); myfile.close(); ``` If I specify the length of buffer to 1000, then the rest of bytes after 1000 will be discarded. If I use: sizeof(buffer) then it is only 1 byte written. How can I get the dynamic size of the buffer?