calculate max name length at compile time

wx257osn2 · Feb 4, 2024 · 61c5c0f · 61c5c0f
1 parent 8d6b476
commit 61c5c0f
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Showing 2 changed files with 21 additions and 2 deletions.
diff --git a/benchmark/include/implementation_macro.hpp b/benchmark/include/implementation_macro.hpp
@@ -34,6 +34,13 @@
 #define OPERATOR_PLUS_EQUAL_IMPLEMENTATION_II_END
 #define OPERATOR_PLUS_EQUAL_IMPLEMENTATION(impls) CAT(OPERATOR_PLUS_EQUAL_IMPLEMENTATION_I impls, _END)
 
+#define MAX_NAME_LENGTH_(name, _0, _1) detail::max{std::string_view{name}.size()} +
+#define MAX_NAME_LENGTH_I(name, _0, _1)  MAX_NAME_LENGTH_(name, _0, _1) MAX_NAME_LENGTH_II
+#define MAX_NAME_LENGTH_II(name, _0, _1) MAX_NAME_LENGTH_(name, _0, _1) MAX_NAME_LENGTH_I
+#define MAX_NAME_LENGTH_I_END detail::max<std::size_t>{3/*qoi*/}
+#define MAX_NAME_LENGTH_II_END detail::max<std::size_t>{3/*qoi*/}
+#define MAX_NAME_LENGTH(impls) (CAT(MAX_NAME_LENGTH_I impls, _END)).t
+
 #define OUTPUT_IMPLEMENTATION_(name, ident, _) \
   if(printer.opt->CAT(run_, ident)) \
     output_lib(os, name, res, res.ident);
@@ -74,7 +81,7 @@
 #define BENCHMARK_ENCODE_CALL_II_END
 #define BENCHMARK_ENCODE_CALL(impls) CAT(BENCHMARK_ENCODE_CALL_I impls, _END)
 
-#define HELP_(name, _0, _1) "    --no" name " " << std::string(9+1-std::strlen(name), '.') << " don't execute " name "\n"
+#define HELP_(name, _0, _1) "    --no" name " " << std::string(benchmark_result_t::printer::max_name_length+1-std::strlen(name), '.') << " don't execute " name "\n"
 #define HELP_I(name, _0, _1)  HELP_(name, _0, _1) HELP_II
 #define HELP_II(name, _0, _1) HELP_(name, _0, _1) HELP_I
 #define HELP_I_END

diff --git a/benchmark/src/qoibench.cpp b/benchmark/src/qoibench.cpp
@@ -81,6 +81,18 @@ struct options{
   }
 };
 
+namespace detail{
+
+template<typename T>
+struct max{
+  T t;
+  constexpr max operator+(const max<T>& rhs)const{
+    return max{std::max(this->t, rhs.t)};
+  }
+};
+
+}
+
 using nanosec = std::chrono::duration<double, std::nano>;
 struct benchmark_result_t{
   struct lib_t{
@@ -124,7 +136,7 @@ struct benchmark_result_t{
         return os;
       }
     };
-    static constexpr std::size_t max_name_length = 9;
+    static constexpr std::size_t max_name_length = MAX_NAME_LENGTH(IMPLEMENTATIONS);
     static std::ostream& output_lib(std::ostream& os, std::string_view name, const benchmark_result_t& res, const lib_t& lib){
       if(!lib.valid)
         return os << name << " outputs invalid content\n";