fix formatting for examples

This is mostly just applying the existing clang format config, except:
- Use NOLINT on overlong comment lines.
- Wrap some sections in 'clang-format off' / 'clang format on'.
- Manually split or join some multi-line strings.

Change-Id: Ia1a40eeb92112e12c3a169309afe087af55b2f4f

examples/robust_curve_fitting.cc

@@ -43,6 +43,7 @@
 //   data = [x', y_observed'];
 
 const int kNumObservations = 67;
+// clang-format off
 const double data[] = {
 0.000000e+00, 1.133898e+00,
 7.500000e-02, 1.334902e+00,
@@ -112,21 +113,20 @@ const double data[] = {
 4.875000e+00, 4.727863e+00,
 4.950000e+00, 4.669206e+00
 };
+// clang-format on
 
 using ceres::AutoDiffCostFunction;
-using ceres::CostFunction;
 using ceres::CauchyLoss;
+using ceres::CostFunction;
 using ceres::Problem;
 using ceres::Solve;
 using ceres::Solver;
 
 struct ExponentialResidual {
-  ExponentialResidual(double x, double y)
-      : x_(x), y_(y) {}
+  ExponentialResidual(double x, double y) : x_(x), y_(y) {}
 
-  template <typename T> bool operator()(const T* const m,
-                                        const T* const c,
-                                        T* residual) const {
+  template <typename T>
+  bool operator()(const T* const m, const T* const c, T* residual) const {
     residual[0] = y_ - exp(m[0] * x_ + c[0]);
     return true;
   }
@@ -147,9 +147,7 @@ int main(int argc, char** argv) {
     CostFunction* cost_function =
         new AutoDiffCostFunction<ExponentialResidual, 1, 1, 1>(
             new ExponentialResidual(data[2 * i], data[2 * i + 1]));
-    problem.AddResidualBlock(cost_function,
-                             new CauchyLoss(0.5),
-                             &m, &c);
+    problem.AddResidualBlock(cost_function, new CauchyLoss(0.5), &m, &c);
   }
 
   Solver::Options options;