I am trying to use std::count over std::vector as following:
int count = std::count( stdVector.begin(), stdVector.end(), "element" );
On windows, it gives the following compiler error.
error C4244: 'initializing' : conversion from '__int64' to 'int', possible loss of data
If I change the code as following on Windows compiler does not appear.
auto count = std::count( stdVector.begin(), stdVector.end(), "element" );
However, now I face the following error on linux for the above change.
error: ISO C++ forbids declaration of 'count' with no type
How would I use std::count which will get build on both the platform without any error?
There are two things that can conflict differently in different environments:
The first is auto as a deduced type is a C++11 feature. May be the linux compiler does not have it as a default (just use -std=c++11, and if it does not have it, upgrade!)
The other is that the return type of std::count is size_t, not int, and size_t to int conversion may lose data depending on on how size_t is defined (there is at least a signed / unsigned mismatch and eventually a different in size of the two types, like 32 bit for int and 64 bit for size_t).