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I do not know about the Filesystem maintainer, but we need a minimal example to reproduce the problem to make our case elsewhere, that is on the bug tracker or on another list.
How about this? void main() { const char * f = "foo"; char b[5]; strcpy(b, f); fs::path p1(b); // Debugger shows p1.m_pathname.size = 4 after this fs::path p2(f); // But p2.m_pathname.size = 3 cout << p1 << endl; // prints "foo " cout << p2 << endl; // prints "foo" cout << (p1 == p2) << endl; // prints 1 - they are supposedly identical } Please can you check that I haven't cocked up the strcpy(), or something idiotic! By all means repeat the exercise with wide characters. This doesn't show a spectacular crash, but I think it shows that something is amiss with the C array handling - something to do with the terminating zero byte? What do you reckon? Will