C++: Do { ... } While (0)

An example from http://webgpu.hwu.crhc.illinois.edu/mp/0

#define wbCheck(stmt) do {                                                    \
        cudaError_t err = stmt;                                               \
        if (err != cudaSuccess) {                                             \
            wbLog(ERROR, "Failed to run stmt ", #stmt);                       \
            wbLog(ERROR, "Got CUDA error ...  ", cudaGetErrorString(err));    \
            return -1;                                                        \
        }                                                                     \
    } while(0)

Explanation:

http://stackoverflow.com/questions/257418/do-while-0-what-is-it-good-for