c++ - Emscripten error when compiling double comparison function 'IsAlmostEqual' -


i'm novice in using emscripten , encountered error in compiling cpp file.

i have iae.cpp:

bool isalmostequal(double a, double b) {   //http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm   long long aint = reinterpret_cast<long long&>(a);   if (aint < 0) aint = -9223372036854775808ll - aint;   long long bint = reinterpret_cast<long long&>(b);   if (bint < 0) bint = -9223372036854775808ll - bint;   return (std::abs(aint - bint) <= 10000); }

i tried compile using emscripten:

emcc iae.cpp

but generates following warnings , errors:

info     root: (emscripten: running sanity checks) warning  root: java not seem exist, required closure compiler. -o2 , above fail. need define java in ~/.emscripten iae.cpp:5:27: warning: integer constant large unsigned     if (aint < 0) aint = -9223372036854775808ll - aint;                           ^ iae.cpp:7:27: warning: integer constant large unsigned     if (bint < 0) bint = -9223372036854775808ll - bint;                           ^ iae.cpp:8:13: error: use of undeclared identifier 'std'     return (std::abs(aint - bint) <= 10000);             ^ 2 warnings , 1 error generated. error    root: compiler frontend failed generate llvm bitcode, halting

how rid of these warnings , errors , possible compile isalmostequal() using emscripten?

seems you

  1. missed include <cstdlib>
  2. try use 64 bit value, not natively supported javascript. can @ expense of performance. read https://github.com/kripken/emscripten/wiki/codeguidelinesandlimitations guidance.

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