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I am looking through some C source code and I don’t understand the following part
#if 1
typedef unsigned short PronId;
typedef unsigned short LMId;
# define LM_NGRAM_INT
#else
typedef unsigned int LMId;
typedef unsigned int PronId;
# undef LM_NGRAM_INT
#endif
Why would someone do #if 1? Isn’t it true that only the first block will ever be processed?
Yes.. Only the first block will be processed — until someone changes the 1 to a 0. Then the other block will be compiled. This is a convenient way to temporary switch blocks of code in and out while testing different algorithms.