Initialization of a wchar_t array with wmemset. Does encoding matter?
How do I correctly initialize a wchar_t array with wmemset?
Should I use '' or L'' ? Does it matter?
does the encoding matter ? (unicode, ISO####)
eg
wchar_t arr[20];
wmemset(arr, '', sizeof(arr));
c++ wchar-t
edited Nov 21 '18 at 5:25
Cœur
18.9k9112154
asked May 14 '15 at 15:09
thahgrthahgr
137215
add a comment |
How do I correctly initialize a wchar_t array with wmemset?
Should I use '' or L'' ? Does it matter?
does the encoding matter ? (unicode, ISO####)
eg
wchar_t arr[20];
wmemset(arr, '', sizeof(arr));
c++ wchar-t
edited Nov 21 '18 at 5:25
Cœur
18.9k9112154
asked May 14 '15 at 15:09
thahgrthahgr
137215
1
Hadn't heard ofwmemsetbefore. Looking at the documentation, the third parameter is the number of characters not bytes so usingsizeofis wrong.
– Mark Ransom
May 14 '15 at 15:12
add a comment |
How do I correctly initialize a wchar_t array with wmemset?
Should I use '' or L'' ? Does it matter?
does the encoding matter ? (unicode, ISO####)
eg
wchar_t arr[20];
wmemset(arr, '', sizeof(arr));
c++ wchar-t
edited Nov 21 '18 at 5:25
Cœur
18.9k9112154
asked May 14 '15 at 15:09
thahgrthahgr
137215
How do I correctly initialize a wchar_t array with wmemset?
Should I use '' or L'' ? Does it matter?
does the encoding matter ? (unicode, ISO####)
eg
wchar_t arr[20];
wmemset(arr, '', sizeof(arr));
c++ wchar-t
c++ wchar-t
edited Nov 21 '18 at 5:25
Cœur
18.9k9112154
asked May 14 '15 at 15:09
thahgrthahgr
137215
edited Nov 21 '18 at 5:25
Cœur
18.9k9112154
asked May 14 '15 at 15:09
thahgrthahgr
137215
edited Nov 21 '18 at 5:25
Cœur
18.9k9112154
edited Nov 21 '18 at 5:25
Cœur
18.9k9112154
edited Nov 21 '18 at 5:25
Cœur
18.9k9112154
18.9k9112154
asked May 14 '15 at 15:09
thahgrthahgr
137215
asked May 14 '15 at 15:09
thahgrthahgr
137215
asked May 14 '15 at 15:09
thahgrthahgr
137215
137215
1
Hadn't heard ofwmemsetbefore. Looking at the documentation, the third parameter is the number of characters not bytes so usingsizeofis wrong.
– Mark Ransom
May 14 '15 at 15:12
add a comment |
1
Hadn't heard ofwmemsetbefore. Looking at the documentation, the third parameter is the number of characters not bytes so usingsizeofis wrong.
– Mark Ransom
May 14 '15 at 15:12
1
1
Hadn't heard of
wmemset before. Looking at the documentation, the third parameter is the number of characters not bytes so using sizeof is wrong.– Mark Ransom
May 14 '15 at 15:12
Hadn't heard of
wmemset before. Looking at the documentation, the third parameter is the number of characters not bytes so using sizeof is wrong.– Mark Ransom
May 14 '15 at 15:12
add a comment |
1 Answer
1
active
oldest
votes
You need to use the L'' form to get a wchar_t type, although any value that fits within a char (such as '') will be automatically converted using the usual integer promotions. See character literal or C++ Character Literals.
It's unclear to me what code page the source will be interpreted in. To be safe, it's best to use a L'u20ac' or L'U000020ac' form to specify characters outside of the ASCII character set.
answered May 14 '15 at 15:24
Mark RansomMark Ransom
226k30286509
thanks for your answer, to help me clarify, I am talking about specifically wmemset, your anwers refer to that? you say that the trailing zero will be the same with''andL''?
– thahgr
May 15 '15 at 7:55
Yes, that's exactly what I'm saying. The parameter towmemsetis awchar_t, and if you give acharinstead it will be promoted so the result is the same.
– Mark Ransom
May 15 '15 at 12:53
add a comment |
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1 Answer
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1 Answer
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You need to use the L'' form to get a wchar_t type, although any value that fits within a char (such as '') will be automatically converted using the usual integer promotions. See character literal or C++ Character Literals.
It's unclear to me what code page the source will be interpreted in. To be safe, it's best to use a L'u20ac' or L'U000020ac' form to specify characters outside of the ASCII character set.
answered May 14 '15 at 15:24
Mark RansomMark Ransom
226k30286509
thanks for your answer, to help me clarify, I am talking about specifically wmemset, your anwers refer to that? you say that the trailing zero will be the same with''andL''?
– thahgr
May 15 '15 at 7:55
Yes, that's exactly what I'm saying. The parameter towmemsetis awchar_t, and if you give acharinstead it will be promoted so the result is the same.
– Mark Ransom
May 15 '15 at 12:53
add a comment |
You need to use the L'' form to get a wchar_t type, although any value that fits within a char (such as '') will be automatically converted using the usual integer promotions. See character literal or C++ Character Literals.
It's unclear to me what code page the source will be interpreted in. To be safe, it's best to use a L'u20ac' or L'U000020ac' form to specify characters outside of the ASCII character set.
answered May 14 '15 at 15:24
Mark RansomMark Ransom
226k30286509
thanks for your answer, to help me clarify, I am talking about specifically wmemset, your anwers refer to that? you say that the trailing zero will be the same with''andL''?
– thahgr
May 15 '15 at 7:55
Yes, that's exactly what I'm saying. The parameter towmemsetis awchar_t, and if you give acharinstead it will be promoted so the result is the same.
– Mark Ransom
May 15 '15 at 12:53
add a comment |
You need to use the L'' form to get a wchar_t type, although any value that fits within a char (such as '') will be automatically converted using the usual integer promotions. See character literal or C++ Character Literals.
It's unclear to me what code page the source will be interpreted in. To be safe, it's best to use a L'u20ac' or L'U000020ac' form to specify characters outside of the ASCII character set.
answered May 14 '15 at 15:24
Mark RansomMark Ransom
226k30286509
You need to use the L'' form to get a wchar_t type, although any value that fits within a char (such as '') will be automatically converted using the usual integer promotions. See character literal or C++ Character Literals.
It's unclear to me what code page the source will be interpreted in. To be safe, it's best to use a L'u20ac' or L'U000020ac' form to specify characters outside of the ASCII character set.
answered May 14 '15 at 15:24
Mark RansomMark Ransom
226k30286509
edited May 14 '15 at 15:38
answered May 14 '15 at 15:24
Mark RansomMark Ransom
226k30286509
answered May 14 '15 at 15:24
Mark RansomMark Ransom
226k30286509
answered May 14 '15 at 15:24
Mark RansomMark Ransom
226k30286509
226k30286509
thanks for your answer, to help me clarify, I am talking about specifically wmemset, your anwers refer to that? you say that the trailing zero will be the same with''andL''?
– thahgr
May 15 '15 at 7:55
Yes, that's exactly what I'm saying. The parameter towmemsetis awchar_t, and if you give acharinstead it will be promoted so the result is the same.
– Mark Ransom
May 15 '15 at 12:53
add a comment |
thanks for your answer, to help me clarify, I am talking about specifically wmemset, your anwers refer to that? you say that the trailing zero will be the same with''andL''?
– thahgr
May 15 '15 at 7:55
Yes, that's exactly what I'm saying. The parameter towmemsetis awchar_t, and if you give acharinstead it will be promoted so the result is the same.
– Mark Ransom
May 15 '15 at 12:53
thanks for your answer, to help me clarify, I am talking about specifically wmemset, your anwers refer to that? you say that the trailing zero will be the same with
'' and L'' ?– thahgr
May 15 '15 at 7:55
thanks for your answer, to help me clarify, I am talking about specifically wmemset, your anwers refer to that? you say that the trailing zero will be the same with
'' and L'' ?– thahgr
May 15 '15 at 7:55
Yes, that's exactly what I'm saying. The parameter to
wmemset is a wchar_t, and if you give a char instead it will be promoted so the result is the same.– Mark Ransom
May 15 '15 at 12:53
Yes, that's exactly what I'm saying. The parameter to
wmemset is a wchar_t, and if you give a char instead it will be promoted so the result is the same.– Mark Ransom
May 15 '15 at 12:53
add a comment |
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1
Hadn't heard of
wmemsetbefore. Looking at the documentation, the third parameter is the number of characters not bytes so usingsizeofis wrong.– Mark Ransom
May 14 '15 at 15:12