> On Sat, 23 Nov 2019 at 13:56, Jonny Grant <jg@xxxxxxxx> wrote: > > I see on my 64bit Ubuntu PC that size_t is 8 bytes, that is 64bits,however I see a warning: > > $ g++-8 -Wall -Wextra -o size_t size_t.cppsize_t.cpp: In function ‘int main()’:size_t.cpp:11:21: > > warning: left shift count >= width of type[-Wshift-count-overflow] size_t big = > > 1<<40; ^~ > > > > > > Same on Godbolt trunk.Is this an issue? > > Why do you expect a different result for these? > A small = 1 << 40;B big = 1 << 40; > In both cases the expression is 1 << 40, the type of A or B is irrelevant. And the default type of a numeric constant is always int. (32 bits). To make the warning go away, typecast the '1' to a size_t first.
