Explicitly cast values of different types

In case the warning -Werror=conversion is active with GCC, the warnings
about "conversion from A to B may change value" lead to a compilation
error. This explicitly convert the values to address these warnings.

src/catch2/benchmark/detail/catch_stats.cpp

@@ -178,7 +178,7 @@ namespace Catch {
                                              double diff = b - m;
                                              return a + diff * diff;
                                          } ) /
-                        ( last - first );
+                        static_cast<double>( last - first );
                     return std::sqrt( variance );
                 }
 
@@ -213,7 +213,7 @@ namespace Catch {
                                               double* first,
                                               double* last ) {
                 auto count = last - first;
-                double idx = (count - 1) * k / static_cast<double>(q);
+                double idx = static_cast<double>((count - 1) * k) / static_cast<double>(q);
                 int j = static_cast<int>(idx);
                 double g = idx - j;
                 std::nth_element(first, first + j, last);
@@ -316,10 +316,10 @@ namespace Catch {
 
                 double accel = sum_cubes / ( 6 * std::pow( sum_squares, 1.5 ) );
                 long n = static_cast<long>( resample.size() );
-                double prob_n =
+                double prob_n = static_cast<double>(
                     std::count_if( resample.begin(),
                                    resample.end(),
-                                   [point]( double x ) { return x < point; } ) /
+                                   [point]( double x ) { return x < point; } )) /
                     static_cast<double>( n );
                 // degenerate case with uniform samples
                 if ( Catch::Detail::directCompare( prob_n, 0. ) ) {

src/catch2/catch_timer.cpp

@@ -30,7 +30,7 @@ namespace Catch {
         return static_cast<unsigned int>(getElapsedMicroseconds()/1000);
     }
     auto Timer::getElapsedSeconds() const -> double {
-        return getElapsedMicroseconds()/1000000.0;
+        return static_cast<double>(getElapsedMicroseconds())/1000000.0;
     }
 
 

src/catch2/internal/catch_random_number_generator.cpp

@@ -52,7 +52,7 @@ namespace {
     SimplePcg32::result_type SimplePcg32::operator()() {
         // prepare the output value
         const uint32_t xorshifted = static_cast<uint32_t>(((m_state >> 18u) ^ m_state) >> 27u);
-        const auto output = rotate_right(xorshifted, m_state >> 59u);
+        const auto output = rotate_right(xorshifted, static_cast<uint32_t>(m_state >> 59u));
 
         // advance state
         m_state = m_state * 6364136223846793005ULL + s_inc;