Add member format_as for std #7465

Job	Run time
build (windows-2019, Win32, v142, 17, Debug)	1m 33s
build (windows-2019, Win32, v142, 17, Release)	2m 23s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 46s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 21s
build (windows-2019, x64, v141, 14, Debug)	1m 36s
build (windows-2019, x64, v141, 14, Release)	2m 5s
mingw (mingw64)	4m 12s
build (windows-2019, x64, v141, 17, Debug)	1m 38s
mingw (ucrt64)	3m 37s
build (windows-2019, x64, v141, 17, Release)	2m 16s
build (windows-2019, x64, v142, 17, Debug)	1m 11s
build (windows-2019, x64, v142, 17, Release)	2m 24s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 12s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 42s
build (windows-2019, x64, v142, 20, Debug)	1m 33s
build (windows-2019, x64, v142, 20, Release)	3m 35s
build (windows-2022, x64, v143, Debug, 20)	2m 3s
	38m 7s

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