Is method 2 valid?
Method 1:
wstring input = L"STRING";
wstring output = input;
transform(outpu t.begin(), output.end(), output.begin(), towupper);
Method 2:
wstring input = L"STRING";
wstring output;
transform(input .begin(), input.end(), output.begin(), towupper);
I"m seeing crash under Visual Studio 2003 with method2. 3 2789
edgekaos wrote: Is method 2 valid?
Method 2: wstring input = L"STRING"; wstring output; transform(input .begin(), input.end(), output.begin(), towupper);
No, it's not. The output iterator needs to be the same length as the
input iterator.
Cheers,
Andre
Sorry to reply to my own post, but... in*****@gmail.c om wrote: edgekaos wrote: Is method 2 valid?
Method 2: wstring input = L"STRING"; wstring output; transform(input .begin(), input.end(), output.begin(), towupper);
No, it's not. The output iterator needs to be the same length as the input iterator.
OR, you can also use std::back_inser ter(). Like so:
string input = "Hello World!";
string output;
transform( input.begin(), input.end(), back_inserter( output ), toupper
);
Cheers,
Andre
edgekaos wrote: Is method 2 valid?
Method 1: wstring input = L"STRING"; wstring output = input; transform(outpu t.begin(), output.end(), output.begin(), towupper);
Method 2: wstring input = L"STRING"; wstring output; transform(input .begin(), input.end(), output.begin(), towupper);
I"m seeing crash under Visual Studio 2003 with method2.
The latter method is not valid. In order to make it valid you should either
pre-set the size of the destination string
wstring input = L"STRING";
wstring output(input.le ngth(), 0);
transform(input .begin(), input.end(), output.begin(), towupper);
or use the 'back_insert_it erator' as the output iterator (see 'int2str's
messages), optionally reserving the required amount of memory in advance
wstring input = L"STRING";
wstring output;
output.reserve( input.length()) ; // <- optional
transform(input .begin(), input.end(), back_inserter(o utput), towupper);
--
Best regards,
Andrey Tarasevich This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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