fix some warnings

include/WfAnalyzer.h

@@ -34,7 +34,7 @@ struct WFData {
 
 // calculate mean and standard deviation of an array
 template<typename T>
-inline void _calc_mean_err(double &mean, double &err, T *source, size_t npts)
+inline void _calc_mean_err(double &mean, double &err, const T *source, size_t npts)
 {
     if (npts == 0) { return; }
 
@@ -53,7 +53,7 @@ inline void _calc_mean_err(double &mean, double &err, T *source, size_t npts)
 }
 
 template<typename T>
-inline void _linear_regr(double &p0, double &p1, double &err, T *x, T *y, size_t npts)
+inline void _linear_regr(double &p0, double &p1, double &err, const T *x, const T *y, size_t npts)
 {
     // no data points
     if (npts == 0) {
@@ -96,7 +96,7 @@ public:
         : thres(threshold), res(resolution) {}
     ~Analyzer() {}
 
-    WFData Analyze(uint32_t *samples, size_t nsamples)
+    WFData Analyze(const uint32_t *samples, size_t nsamples)
     {
         WFData data;
         if (!nsamples) { return data; }
@@ -142,7 +142,7 @@ public:
             return false;
         };
 
-        int nped = 0;
+        size_t nped = 0;
         auto ybuf = buffer;
         for (size_t i = res + 1; i < nsamples - res - 1; ++i) {
             if (!in_peaks(candidates, i)) {
@@ -221,7 +221,7 @@ private:
 public:
     // static methods
     template<typename T>
-    static std::vector<double> SmoothSpectrum(T *samples, size_t nsamples, size_t res)
+    static std::vector<double> SmoothSpectrum(const T *samples, size_t nsamples, size_t res)
     {
         std::vector<double> buffer(nsamples);
         for (size_t i = 0; i < nsamples; ++i) {
@@ -245,7 +245,7 @@ public:
         _calc_mean_err(res.mean, res.err, ybuf, npts);
         // interatively fit
         while (max_iters-- > 0) {
-            int count = 0;
+            size_t count = 0;
             for (size_t i = 0; i < npts; ++i) {
                 if (std::abs(ybuf[i] - res.mean) < res.err*thres) {
                     ybuf[count] = ybuf[i];