Link error: undef reference - friend function

问题

Just the salient details:

Compilation:

g++ -c memref_test.cpp
g++ -c -I/home/chap/private/WDI/git -I/home/chap/private/WDI/git/include -I/usr/local/mysql/include -I/usr/local/include   -I/home/chap/private/WDI/git -I/home/chap/private/WDI/git/include -I/usr/include/mysql -fno-strict-aliasing  -g -O0 --std=c++11  MemRef.cpp
g++ -o memref_test memref_test.o MemRef.o

Error:

MemRef.h:36:24: warning: inline function ‘bool operator<(const MemRef&, const MemRef&)’ used but never defined [enabled by default]

/usr/include/c++/4.7/bits/stl_algo.h:86: undefined reference to `operator<(MemRef const&, MemRef const&)'

MemRef.h:

class MemRef {
    public:
        friend inline bool operator< (const MemRef& lhs, const MemRef& rhs);
};

MemRef.cpp:

inline bool 
operator< (const MemRef& lhs, const MemRef& rhs){
    int minlen = 
        lhs._len <= rhs._len 
        ? lhs._len 
        : rhs._len;
    int res = memcmp(lhs._ptr, rhs._ptr, minlen);
    if (res < 0) return true;
    if (res > 0) return false;
    // equal for minlen, so he with the lesser length wins
    return (lhs._len < rhs._len);
}

memref_test.cpp:

deque<MemRef> memrefs;
const string record("Record 1\tABLE\tBAKER\tCHARLIE");
MemRef::split(memrefs, record, '\t');
std::sort(memrefs.begin(), memrefs.end());

I've racked my brain for six hours, googling and searching SO, and I need help. Thanks.

来源：https://stackoverflow.com/questions/20168819/link-error-undef-reference-friend-function