g++ warn for conversion to bool

[Jonny Grant <jg@xxxxxxxx>]

Hello
Is there a warning option for g++ to warn for implicit conversion to bool?

// g++-8 -Wall -o bool2 bool2.cpp
#include <stdio.h>

int main()
{
    int a = 3;
    bool b = a;

    printf("bool %d\n", b);
}


$ ./bool2
bool 1


Cheers, Jonny