Does the gcc compiler optimize the following code?
std::vector v(5);
std::vector::iterator it;
for(it = v.begin(); it != v.end(); it++)
Or is it faster to do this:
std::vector v(5);
std::vector::iterator it;
std::vector::iterator end(v.end());
for(it = v.begin(); it != end; ++it)
Note that the temp variable end, and the preincrement of it.
I was reading Exceptional C++ and it says the second way is faster, but I'm
wondering if the comipler has gotten better since the boo
comiple的时候提示”Segmentation fault: 11“
void merge(int a[], int const p, int const q, int const r)
{
int n=q-p;
int m=r-q;
int L[n+1];
int R[m+1];
//copy the left part
for(int i=0; i
{
L[i]=a[p+i];
}
//copy the right array
for(int j=0; j
{
R[j]=a[q+j];
}
int i=0;
int j=0;
while( i
{
if(L[i]
{
a[i+j]=L[j];
i++;
}
else
{
a[i+j]=R[j];
j++;
}
}
Compile MEX-function from C/C++ or Fortran source code http://www.mathworks.com/help/techdoc/ref/mex.html
To work the other way round,
Interface MATLAB code with C/C++ (MATLAB 6.5 (R13) or earlier) http://www.mathworks.com/support/compilers/interface_r13.html
normally such term is called cross-platform, cross-comipler cross- somthing,
or interoperability inter- something.
Did some such experiments before, proved to be not very flexibly. Matlab set
a lot of limits. So you heap won't be big enough... 阅读全帖
it is necessary if not sufficient that programmable language is regular
language, so the symbol rules will deterministically lead to results.
Nature language is a biological language of physics words that has no
literals at least well defined. That should be understood as dynamical
system (stability, bifurcation, chaotic analyisis).
Basic understanding of comiplers and cpu architecure,
-- my five cents opinion
I comipled and installed cxterm under solaris 2.7 in my home directory.
when I telnet to bbs, it just display ASCII characters.
Any suggestions?
I think it is an environment problem not font problem.
