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Showing content from https://github.com/cplusplus/CWG/issues/479 below:

CWG2855 [expr.post.incr] has no integral promotion, [expr.pre.incr] has · Issue #479 · cplusplus/CWG · GitHub

Full name of submitter: Lénárd Szolnoki

Reference (section label): [expr.post.incr]

The value of the operand object is modified by adding 1 to it.

consider:

This has undefined behavior: the value is increased by 1 but the resulting value is not representable in int8_t [expr.pre].

In comparison [expr.pre.incr] in addition has:

The expression ++x is equivalent to x+=1.

Which in turn is equivalent to x = x + 1, except that x is evaluated only once. This implies that integral promotion rules are considered.

Because of this the following is defined:

where ++x is equivalent to x = (int)x + 1.

GCC, clang and MSVC accept both examples above in constant expressions. They otherwise detect overflowing increments when no promotion is involved.

Spell out that the side effects of post-increment are equivalent to the side-effects of pre-increment, with the implied integral promotions.

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