Styleguide tacit agreements.

docs/CPP_STYLE.md

@@ -25,7 +25,8 @@ Naming and formatting
 - Space after the keyword in conditions and loops. Space after `;` in `for` loop.
 - Space between binary operators: `x = y * y + z * z`.
 - Space after double dash.
-- Compile-time constants must be named in camelCase, starting with a lower-case `k`, e.g. `kCompileTimeConstant`.
+- We use `using` keyword instead of `typedef`.
+- Compile-time constants must be named in camelCase, starting with a lower-case `k`, e.g. `kCompileTimeConstant` and marked as `constexpr` when possible.
 - Values of enum classes must be named in CamelCase, e.g. `enum class Color { Red, Green, LightBlue };`.
 - Macros and C-style enums must be named in UPPER_CASE, and enum values must be prefixed with a capitalized enum name.
 
@@ -48,7 +49,7 @@ To automatically format a file, install `clang-format` and run:
 
 #include "std/math.hpp"
 
-uint16_t const kBufferSize = 255;
+uint16_t constexpr kBufferSize = 255;
 
 // C-style enums are ALL_CAPS. But remember that C++11 enum classes are preferred.
 enum Type
@@ -58,7 +59,7 @@ enum Type
   TYPE_STRING
 };
 
-typedef double TMyTypeStartsWithCapitalTLetter;
+using TMyTypeStartsWithCapitalTLetter = double;
 
 class ComplexClass
 {