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Fix a WIN32 -> _WIN32 typo and try to make some comments more readable.

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gm 2015-09-24 14:46:20 +12:00
parent c8ee261043
commit 0791828329
1 changed files with 15 additions and 13 deletions
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28
tz.cpp
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@ -35,28 +35,30 @@
#include <tuple>
#include <vector>
#include <sys/stat.h>
#ifdef WIN32
#ifdef _WIN32
#include <locale>
#include <codecvt>
#endif
#if TIMEZONE_MAPPING
// Timezone mapping is mapping native timezone names to "Standard" ones.
// Mapping reades a CSV file for the data and currently uses
// std::quoted to do that which is a C++14 feature found in iomanip.
// VS2015 supports std::quoted but MSVC has a mixed rather
// than strict standard support so there is no -std=c++14 flag for MSVC.
// MingW is a Windows based platform so requires mapping and thefore C++14.
// Linux/Mac currently do not require mapping so C++14 isn't needed for this
// so C++11 should work.
// Timezone mapping maps native (e.g. Windows) timezone names to the "Standard" names
// used by this library.
// The mapping process parses a CSV file of mapping data and uses std::quoted to do that.
// Because std::quoted is a C++14 feature found in <iomanip> any platforms using
// the mapping process require C++14.
// Windows uses the mapping process so C++14 is required on Windows.
// VS2015 supports std::quoted but there is no -std=c++14 flag required to enable it.
// MinGW on Windows also requires the mapping process so -std=c++14 is required
// when using g++ or clang.
// On Linux/Mac, no mapping / CSV file is required so std::quoted and C++14 isn't needed
// and so on these platforms C++11 should work but C++14 is preferred even there too
// because the date library in general works better with C++14.
#include <iomanip>
#endif
// unistd.h is used on some platforms as part of the the means to get
// the current time zone. However unistd.h only somtimes exists on Win32.
// gcc/mingw support unistd.h on Win32 but MSVC does not.
// However on Win32 we don't need unistd.h anyway to get the current timezone
// as Windows.h provides a means to do it
// the current time zone. On Win32 Windows.h provides a means to do it.
// gcc/mingw supports unistd.h on Win32 but MSVC does not.
#ifdef _WIN32
#include <Windows.h>