In [C++]

Fundamentals (x86-64)

TypeSize
bool, char1
short, char16_t2
int, float, char32_t4
long long, double, pointer, size_t8
long8 (Linux) / 4 (Windows)
wchar_t4 (Linux) / 2 (Windows)
long double16 (x87, 80-bit padded) / 8 on MSVC
max_align_t32