C++

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Reference

• C library:

  • <cassert> (assert.h)
  • <cctype> (ctype.h)
  • <cerrno> (errno.h)
  • C++11
    <cfenv> (fenv.h)
  • <cfloat> (float.h)
  • C++11
    <cinttypes> (inttypes.h)
  • <ciso646> (iso646.h)
  • <climits> (limits.h)
  • <clocale> (locale.h)
  • <cmath> (math.h)
  • <csetjmp> (setjmp.h)
  • <csignal> (signal.h)
  • <cstdarg> (stdarg.h)
  • C++11
    <cstdbool> (stdbool.h)
  • <cstddef> (stddef.h)
  • C++11
    <cstdint> (stdint.h)
  • <cstdio> (stdio.h)
  • <cstdlib> (stdlib.h)
  • <cstring> (string.h)
  • C++11
    <ctgmath> (tgmath.h)
  • <ctime> (time.h)
  • C++11
    <cuchar> (uchar.h)
  • <cwchar> (wchar.h)
  • <cwctype> (wctype.h)

• Containers:

  • C++11
    <array>
  • <deque>
  • C++11
    <forward_list>
  • <list>
  • <map>
  • <queue>
  • <set>
  • <stack>
  • C++11
    <unordered_map>
  • C++11
    <unordered_set>
  • <vector>

• Input/Output:

  • <fstream>
  • <iomanip>
  • <ios>
  • <iosfwd>
  • <iostream>
  • <istream>
  • <ostream>
  • <sstream>
  • <streambuf>

• Multi-threading:

  • C++11
    <atomic>
  • C++11
    <condition_variable>
  • C++11
    <future>
  • C++11
    <mutex>
  • C++11
    <thread>

• Other:

  • <algorithm>
  • <bitset>
  • C++11
    <chrono>
  • C++11
    <codecvt>
  • <complex>
  • <exception>
  • <functional>
  • C++11
    <initializer_list>
  • <iterator>
  • <limits>
  • <locale>
  • <memory>
  • <new>
  • <numeric>
  • C++11
    <random>
  • C++11
    <ratio>
  • C++11
    <regex>
  • <stdexcept>
  • <string>
  • C++11
    <system_error>
  • C++11
    <tuple>
  • C++11
    <type_traits>
  • C++11
    <typeindex>
  • <typeinfo>
  • <utility>
  • <valarray>

<valarray>

• classes

  • gslice
  • gslice_array
  • indirect_array
  • mask_array
  • slice
  • slice_array
  • valarray

• functions

  • abs
  • acos
  • asin
  • atan
  • atan2
  • cos
  • cosh
  • exp
  • log
  • log10
  • pow
  • sin
  • sinh
  • sqrt
  • tan
  • tanh

std::atan2

template<class T> valarray<T> atan2 (const valarray<T>& y, const valarray<T>& x);template<class T> valarray<T> atan2 (const valarray<T>& y, const T& x);template<class T> valarray<T> atan2 (const T& y, const valarray<T>& x);

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// atan2 valarray example
#include <iostream>     // std::cout
#include <cstddef>      // std::size_t
#include <cmath>        // std::atan2
#include <valarray>     // std::valarray, std::atan2

int main ()
{
  double y[] = {0.0, 3.0, -2.0};
  double x[] = {-3.0, 3.0, -1.0};
  std::valarray<double> ycoords (y,3);
  std::valarray<double> xcoords (x,3);

  std::valarray<double> results = atan2 (ycoords,xcoords);

  std::cout << "results:";
  for (std::size_t i=0; i<results.size(); ++i)
    std::cout << ' ' << results[i];
  std::cout << '\n';

  return 0;
}

results: 3.14159 0.785398 -2.03444