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“Undefined reference to” template class constructor [duplicate]
...er won't compile the constructors cola<float>::cola(...) and cola<string>::cola(...) until it is forced to do so. And we must ensure that this compilation happens for the constructors at least once in the entire compilation process, or we will get the 'undefined reference' error. (This a...
Case-insensitive string comparison in C++ [closed]
What is the best way of doing case-insensitive string comparison in C++ without transforming a string to all uppercase or all lowercase?
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How to use putExtra() and getExtra() for string data
...xactly to use getExtra() and putExtra() for intents? Actually I have a string variable, say str, which stores some string data. Now, I want to send this data from one activity to another activity.
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Meaning of acronym SSO in the context of std::string
...ral answers referred to "SSO" in the context of optimizing copies of std::string . What does SSO mean in that context?
3 A...
Common MySQL fields and their appropriate data types
... |
| salt | CHAR(x) | randomly generated string, usually of
fixed length (x)
| digest (md5) | CHAR(32) | |
| phone number | VAR...
const char* concatenation
...ointed to by these pointers. So anything like:
strcat(one,two); // append string two to string one.
will not work. Instead you should have a separate variable(char array) to hold the result. Something like this:
char result[100]; // array to hold the result.
strcpy(result,one); // copy string...
Hidden Features of MySQL
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Binary Protocol:
MySQL 4.1 introduced a binary protocol that allows non-string data values to be sent
and returned in native format without conversion to and from string format. (Very usefull)
Aside, mysql_real_query() is faster than mysql_query() because it does not call strlen()
to opera...
MySQL - length() vs char_length()
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LENGTH() returns the length of the string measured in bytes.
CHAR_LENGTH() returns the length of the string measured in characters.
This is especially relevant for Unicode, in which most characters are encoded in two bytes. Or UTF-8, where the number of by...
Remove spaces from std::string in C++
What is the preferred way to remove spaces from a string in C++? I could loop through all the characters and build a new string, but is there a better way?
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Clean code to printf size_t in C++ (or: Nearest equivalent of C99's %z in C++)
...l combine it with IOStreams to get type-safe behavior:
size_t foo = bar;
ostringstream os;
os << foo;
printf("%s", os.str().c_str());
It's not super-efficient, but your case above deals with file I/O, so that's your bottleneck, not this string formatting code.
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