https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88365
Bug ID: 88365
Summary: -Wsign-conversion ignores implicit conversion
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: igor.chorazewicz at intel dot com
Target Milestone: ---
Consider following code, compiled with -Wsign-conversion:
#include <iostream>
template <typename T>
struct wrapper {
T t;
operator T()
{
return t;
}
T get()
{
return t;
}
};
int main() {
int a[10];
int* x { a } ;
wrapper<long unsigned int> y{2};
std::cout << (x + y); // warning
}
It produces "warning: conversion to 'long int' from 'long unsigned int' may
change the sign of the result". If y is of type "long unsigned int", there is
no warning. Moreover when I explicitly call y.get() there is also no warning:
std::cout << (x + y.get()); // ok
