Build error for fastApproxMatch()

[dgtlmoon]

Build error trying to use fastApproxMatch

diff --git a/main.cpp b/main.cpp
index 8e80285..b917772 100644
--- a/main.cpp
+++ b/main.cpp
@@ -85,13 +85,14 @@ int main() {
        Matcher<false> m(tvecs, size, qvecs, size, threshold, max_twiddles);
 
        std::cout << std::endl << "Warming up..." << std::endl;
-       for (int i = 0; i < warmups; ++i) m.bruteMatch();
+       for (int i = 0; i < warmups; ++i) m.fastApproxMatch();^M
        std::cout << "Testing..." << std::endl;
        high_resolution_clock::time_point start = high_resolution_clock::now();
-       for (int i = 0; i < runs; ++i) m.bruteMatch();
+       for (int i = 0; i < runs; ++i) m.fastApproxMatch();^M
        high_resolution_clock::time_point end = high_resolution_clock::now();
 
        const double sec = static_cast<double>(duration_cast<nanoseconds>(end - start).count()) * 1e-9 / static_cast<double>(runs);
        std::cout << std::endl << "Brute force K2NN found " << m.matches.size() << " matches in " << sec * 1e3 << " ms" << std::endl;
        std::cout << "Throughput: " << static_cast<double>(size)*static_cast<double>(size) / sec * 1e-9 << " billion comparisons/second." << std::endl << std::endl;
+^M
 }

g++ -c  -Wall -Wextra -Werror -Wshadow -pedantic -Ofast -std=gnu++17 -fomit-frame-pointer -mavx2 -march=native -mfma -flto -funroll-all-loops -fpeel-loops -ftracer -ftree-vectorize  main.cpp -o main.o
In file included from main.cpp:53:0:
K2NN.h: In instantiation of ‘void Matcher<eightbit>::_tabulate(int, int) [with bool eightbit = false]’:
K2NN.h:184:44:   required from ‘void Matcher<eightbit>::tabulate() [with bool eightbit = false]’
K2NN.h:378:11:   required from ‘void Matcher<eightbit>::fastApproxMatch() [with bool eightbit = false]’
main.cpp:88:54:   required from here
K2NN.h:191:30: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
   for (uint64_t i = start; i < start + count; ++i) {
                              ^
cc1plus: all warnings being treated as errors
Makefile:17: recipe for target 'main.o' failed
make: *** [main.o] Error 1

[komrad36]

Fixed. Thanks! Nice catch!

Reason: I develop on Windows and MSVC doesn't warn on unsigned/signed compare unless it's obviously dangerous. The default case (bruteMatch) doesn't exhibit the problem so my automated g++ test passes. Perfect storm.