Fixes and clarify workaround of access issue with friend functions with msvc #12
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I replaced
WIN32
by_WIN32
because the first one is defined by headers from window's sdk, not by the compiler, while the second one is defined by the compiler.Details of the access issue:
https://developercommunity.visualstudio.com/t/Private-member-inaccessible-when-used-in/10448363?q=friend+private