"what's the fastest way to convert hex to integer in c++?" Code Answer
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proposed solutions that render faster than the op's if-else:
provided that your input strings are always hex numbers you could define a lookup table as an
or if you want something more faster instead of an
unordered_mapyou could use the new c++14 facilities with user literal types and define your table as a literal type at compile time:
i ran benchmarks with the code written by nikos athanasiou that was posted recently on isocpp.org as a proposed method for c++ micro-benchmarking.
the algorithms that were compared are:
1. op's original
2. compact if-else, proposed by christophe:
3. corrected ternary operator version that handles also capital letter inputs, proposed by g24l:
4. lookup table (
tableis the unordered map shown previously.
5. lookup table (user
where table is user defined literal as shown above.
i defined a function that transforms an input hex string to an integer:
i also defined a function that populates a vector of strings with random hex strings:
i created vectors populated with 50000, 100000, 150000, 200000 and 250000 random hex strings respectively. then for each algorithm i run 100 experiments and averaged the time results.
compiler was gcc version 5.2 with optimization option
from the results we can conclude that for these experimental settings the proposed table method out-performs all the other methods. the if-else method is by far the worst where as the
unordered_mapalthough it wins the if-else method it is significantly slower than the other proposed methods.
results for method proposed by stgatilov, with bitwise operations:
i also tested the original code from g24l against the table method:
note that this method doesn't handle capital letters
still the table method renders faster.