[Bug libstdc++/42242] New: vector::resize unnecessarily calls null constructor

[igodard at pacbell dot net]

This code shows that the resize member function is calling the null constructor
even when the size does not need to be changed.

#include    <vector>
#include    <iostream>
class c {
public:
            c() { std::cerr << "c null constructor called\n"; }
            c(int i) : i(i) {}
    int     i;
    };

int main() {
    std::vector<c>f;
    f.push_back(c(0));
    f.resize(1);
    return 0;
    }


-- 
           Summary: vector::resize unnecessarily calls null constructor
           Product: gcc
           Version: 4.4.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: igodard at pacbell dot net


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42242