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C＋＋模板的特化 - C/C++ - 清泛网 - 专注C/C++及内核技术
... t1, const T t2)
{
return t1 < t2 ? t2 : t1;
}
template <>
const char* mymax(const char* t1,const char* t2)
{
return (strcmp(t1,t2) < 0) ? t2 : t1;
}
但是你不能这么搞：
template <>
bool mymax(const char* t1,const char* t2)
{
return (strcmp(t1,t2) < 0);
}
其实...
What is the best way to use a HashMap in C++?
...lude <cassert>
int main(int argc, char **argv)
{
std::map<std::string, int> m;
m["hello"] = 23;
// check if key is present
if (m.find("world") != m.end())
std::cout << "map contains key world!\n";
// retrieve
std::cout << m["hello"] << '\n';
std::map&...
Python: How to create a unique file name?
...
uuid seems to create a long unique string. I dont think its better to have file name with long string and UUID, () in it.
– MysticCodes
Jun 3 '10 at 10:37
...
What are “connecting characters” in Java identifiers?
...ter.isJavaIdentifierStart(i)) {
System.out.println("character: " + String.valueOf(Character.toChars(i))
+ ", codepoint: " + i + ", hexcode: " + Integer.toHexString(i));
}
}
prints the connecting characters that can be used to start an identifer on jdk1.6.0_45
character...
Maximum filename length in NTFS (Windows XP and Windows Vista)?
...OS and (WIN32DOS - when a filename can be natively a DOS name). (Since the string has a length, it could contain \0 but that would yield to problems and is not in the namespaces above.)
Thus the name of a file or directory can be up to 255 characters. When specifying the full path under Windows, yo...
Getting LaTeX into R Plots
...
By approximately, I meant that LaTeX strings are translated into R's plotmath expressions -- which means that if plotmath does not support a specific LaTeX symbol, it will either not be rendered or it will be rendered by combining symbols that are available.
...
How can I find non-ASCII characters in MySQL?
...
This only works (for me anyway) to find strings that contain NONE of those characters. It does not find strings that contain a mix of ASCII and non-ASCII characters.
– Ian
Sep 11 '18 at 7:24
...
Difference between >>> and >>
...y signed numbers by 2^k, I find it weird that this is everyone's answer. A string of bits isn't a number, and >> can always be used on any string of bits: it always does the same thing regardless of the role that string of bits is playing and regardless of whether it has a concept of 'sign'. W...
Type erasure techniques
...oid>)> call;
call = reinterpret_cast<voidFun>(fun<std::string>);
call(std::make_shared<std::string>("Hi there!"));
call = reinterpret_cast<voidFun>(fun<int>);
call(std::make_shared<int>(33));
call = reinterpret_cast<voidFun>(fun&...
How do I show the value of a #define at compile-time?
...al query, but this may still be useful.
This can be done in GCC using the stringify operator "#", but it requires two stages.
#define XSTR(x) STR(x)
#define STR(x) #x
The value of a macro can then be displayed with:
#pragma message "The value of ABC: " XSTR(ABC)
See: 3.4 Stringification in th...