SockeClient.h file
#define SIZE_OF_BUFFER 4096 class SocketClient { public: SocketClient(int cfd); virtual ~SocketClient(); int recv(); int getFd(); protected: int m_fd; char *m_buffer; vector<char> m_vbuffer; }; I was trying to do
vector<char> m_vbuffer(SIZE_OF_BUFFER); And I got a syntax error... How do I initialize the vector with size of 4096. Thanks in advance
Use member-initialization-list, in the constructor's definition as:
class SocketClient { public: SocketClient(int cfd) : m_vbuffer(SIZE_OF_BUFFER) { //^^^^^^^^^^^^^^^^^^^^^^^^^^^ member-initialization-list //other code... } protected: int m_fd; char *m_buffer; vector<char> m_vbuffer; }; You can use member-initialization-list to initialize many members as:
class A { std::string s; int a; int *p; A(int x) : s("somestring"), a(x), p(new int[100]) { //other code if any } ~A() { delete []p; //must deallocate the memory! } }; 
reserve is not enough if you use the vector as a buffer. It needs to have a size() and not just a capacity().Call m_vbuffer->reserve(SIZE_OF_BUFFER) in the constructor of SocketClient.
In addition to other answers consider using some circular buffer instead of vector. There is one in boost.
