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Sun Studio 12: C++ User's Guide

User-Defined I/O Operations

To be MT-safe, I/O operations defined for a user-defined type that involve a specific ordering of separate operations must be locked to define a critical region. The following example shows a user-defined I/O operation:

Example 11–3 User-Defined I/O Operations


#include <rlocks.h>
#include <iostream.h>
class mystream: public istream {

    // other definitions...
    int getRecord(char* name, int& id, float& gpa);
};

int mystream::getRecord(char* name, int& id, float& gpa)
{
    stream_locker sl(this, stream_locker::lock_now);

    *this >> name;
    *this >> id;
    *this >> gpa;

    return this->fail() == 0;
}