bwuh.cpp

struct S {
    S(int) {}
    S(const S&) = delete;
};

int main() {
    auto a = S { 5 }; // no go
    S s {5}; // ok
    return 0;
}

bwuh2.cpp

#include <stdio.h>

struct S {
    S() {
        printf("Default ctor\n");
    }
    S(int x) {
        printf("int ctor %i\n", x);
    }

    S(const S&) {
        printf("Copy ctor\n");
    }

    ~S() {
        printf("dtor\n");
    }
};

int main() {
    auto a = S { 5 };
    S s {5};
    return 0;
}

/* prints

int ctor 5
int ctor 5
dtor
dtor

*/