c++ - Is it possible to force `round` to be in namespace std? -

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i need declare own function double round(double,double) extern "c" , conflicts double round(double) declared in <bits/mathcalls.h> (gcc 5.4.0). , because include <cstdint>.

there preprocessor variable _glibcpp_use_namespaces, seems enforce namespace std around round, defining yields error 

/usr/include/c++/5/cwchar:141:11: error: ‘::btowc’ has not been declared

when <map> included, need later on.

is there other way?

it looks there no official way prevent round in global namespace , existence of _glibcpp_use_namespaces in gcc's implementation of standard library indicates such possibility indeed, not find documentation preprocessor variable , if possible in older version broken.


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