As far as I'm concerned you couldn't ignore the warning generated by the compiler. Here the compiler will generate Compiler Warning (level 1) C4838 .
In general, for violations of the language rules, the C++ standard requires that the compiler issue a diagnostic. It did that. The Standard specifies that a diagnostic is required in case that a program is ill-formed. Which is the case when a narrowing-conversion takes place inside a braced-initializer.
According to the Doc: Implicit type conversions
If the selected conversion is a promotion, the compiler does not issue a warning. If the conversion is a narrowing, the compiler issues a warning about possible data loss. Whether actual data loss occurs depends on the actual values involved, but we recommend that you treat this warning as an error.
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