Add const attributes to IntSimMatrix multiplier

IntSimMatrix no longer contains variable members.

Signed-off-by: Stefan Weil <sw@weilnetz.de>

src/arch/intsimdmatrix.cpp

@@ -28,8 +28,8 @@ namespace tesseract {
 // Factory makes and returns an IntSimdMatrix (sub)class of the best
 // available type for the current architecture.
 /* static */
-IntSimdMatrix* IntSimdMatrix::GetFastestMultiplier() {
-  IntSimdMatrix* multiplier;
+const IntSimdMatrix* IntSimdMatrix::GetFastestMultiplier() {
+  const IntSimdMatrix* multiplier;
   if (SIMDDetect::IsAVX2Available()) {
     multiplier = new IntSimdMatrixAVX2();
   } else if (SIMDDetect::IsSSEAvailable()) {

src/arch/intsimdmatrix.h

@@ -71,7 +71,7 @@ class IntSimdMatrix {
 
   // Factory makes and returns an IntSimdMatrix (sub)class of the best
   // available type for the current architecture.
-  static IntSimdMatrix* GetFastestMultiplier();
+  static const IntSimdMatrix* GetFastestMultiplier();
 
   // Computes a reshaped copy of the weight matrix w. If there are no
   // partial_funcs_, it does nothing.

src/lstm/networkio.cpp

@@ -34,7 +34,7 @@ const float kMinProb = exp(kMinCertainty);
 // Holds the optimal integer multiplier for this machine.
 // This is a leaked, lazily initialized singleton, and is used for computing
 // padding to apply to i_ for SIMD use.
-IntSimdMatrix* NetworkIO::multiplier_ = nullptr;
+const IntSimdMatrix* NetworkIO::multiplier_ = nullptr;
 
 // Resizes to a specific size as a 2-d temp buffer. No batches, no y-dim.
 void NetworkIO::Resize2d(bool int_mode, int width, int num_features) {

src/lstm/networkio.h

@@ -341,7 +341,7 @@ class NetworkIO {
   // Holds the optimal integer multiplier for this machine.
   // This is a leaked, lazily initialized singleton, and is used for computing
   // padding to apply to i_ for SIMD use.
-  static IntSimdMatrix* multiplier_;
+  static const IntSimdMatrix* multiplier_;
 };
 
 }  // namespace tesseract.

src/lstm/weightmatrix.h

@@ -179,7 +179,7 @@ class WeightMatrix {
   // The weights matrix reorganized in whatever way suits this instance.
   std::vector<int8_t> shaped_w_;
   // Holds the optimal integer multiplier for this machine.
-  std::unique_ptr<IntSimdMatrix> multiplier_;
+  std::unique_ptr<const IntSimdMatrix> multiplier_;
 };
 
 }  // namespace tesseract.