Remove usage of std::binary_function and std::bind1st.

- Deprectated since C++11, removed in C++17

src/algorithms/highlevel/chromaprinter.cpp

@@ -54,7 +54,7 @@ void Chromaprinter::compute() {
   // Copy the signal to new vector to expand it to the int16_t dynamic range before the cast.
   std::vector<Real> signalScaled = signal;
   std::transform(signalScaled.begin(), signalScaled.end(), signalScaled.begin(),
-                 std::bind1st(std::multiplies<Real>(), pow(2,15)));
+                 std::bind(std::multiplies<Real>(), pow(2,15), std::placeholders::_1));
 
   std::vector<int16_t> signalCast(signalScaled.begin(), signalScaled.end());
 
@@ -160,7 +160,7 @@ AlgorithmStatus Chromaprinter::process() {
     // Copy the signal to new vector to expand it to the int16_t dynamic range before the cast.
     std::vector<Real> signalScaled = signal;
     std::transform(signalScaled.begin(), signalScaled.end(), signalScaled.begin(),
-                   std::bind1st(std::multiplies<Real>(), pow(2,15)));
+                   std::bind(std::multiplies<Real>(), pow(2,15), std::placeholders::_1));
 
     std::vector<int16_t> signalCast(signalScaled.begin(), signalScaled.end());
 

src/essentia/essentiamath.h

@@ -831,7 +831,7 @@ std::vector<T> derivative(const std::vector<T>& array) {
 }
 
 template<typename T, typename U, typename Comparator=std::greater<T> >
-class PairCompare : public std::binary_function<T, U, bool> {
+class PairCompare {
   Comparator _cmp;
   public:
     bool operator () (const std::pair<T,U>& p1, const std::pair<T,U>& p2) const {

src/essentia/types.h

@@ -115,8 +115,7 @@ inline bool case_insensitive_char_cmp(char a, char b) {
 /**
  * Function object for comparing two strings in a case-insensitive manner.
  */
-struct case_insensitive_str_cmp
-  : public std::binary_function<const std::string&, const std::string&, bool> {
+struct case_insensitive_str_cmp {
   bool operator()(const std::string& str1, const std::string& str2) const {
     return std::lexicographical_compare(str1.begin(), str1.end(),
                                         str2.begin(), str2.end(),

src/essentia/utils/peak.h

@@ -71,7 +71,7 @@ class Peak {
 // the positions are equal it sorts by descending magnitude
 template<typename Comp1=std::less<Real>,
          typename Comp2=std::greater_equal<Real> >
-class ComparePeakPosition : public std::binary_function<Real, Real, bool> {
+class ComparePeakPosition {
   Comp1 _cmp1;
   Comp2 _cmp2;
   public:
@@ -86,7 +86,7 @@ class ComparePeakPosition : public std::binary_function<Real, Real, bool> {
 // the magnitudes are equal it sorts by ascending position
 template<typename Comp1=std::greater<Real>,
          typename Comp2=std::less_equal<Real> >
-class ComparePeakMagnitude : public std::binary_function<Real, Real, bool> {
+class ComparePeakMagnitude {
   Comp1 _cmp1;
   Comp2 _cmp2;
   public: