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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/../cpp/locale/locale/global.html below:

std::locale::global - cppreference.com

static locale global( const locale& loc );

Replaces the global C++ locale with loc, which means all future calls to the std::locale default constructor will now return a copy of loc. If loc has a name, also replaces the C locale as if by std::setlocale(LC_ALL, loc.name().c_str());. This function is the only way to modify the global C++ locale, which is otherwise equivalent to std::locale::classic() at program startup.

[edit] Parameters loc - the new global C++ locale [edit] Return value

The previous value of the global C++ locale.

[edit] Example [edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior LWG 8 C++98 it was unspecified whether other library functions (such
as std::setlocale) can modify the global C++ locale specified (no other
library functions allowed) [edit] See also

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