- const README: rewrite the space-saving claim per issue #5 follow-ups
(constant-expression const vs #define immediates; which const qualify
as constant expressions)
- const README: fix the class-section diagnosis per issue #338 (overload
resolution picks the const overload; the restriction only surfaces
once that overload is removed)
- sizeof README: virtual-inheritance result is compiler-dependent
(GCC merges vbptr+vfptr -> 16, MSVC keeps them separate -> 32) #246
- static README: new section on internal linkage / access restriction
with anonymous-namespace comparison #142
- 10-day practice: full problem list table + fixed day links #136
- new design_pattern/singleton/singleton_default.hpp: reusable
thread-safe CRTP singleton template, compile+concurrency tested #303
