多重継承すると後ろ側のクラスで分岐が発生する？ ref: http://qiita.com/abedominal/items/a845b81b1057279b79b7

Hage.hpp

#ifndef __HAGE_HPP__
#define __HAGE_HPP__

class NotifierA
{
public:
    virtual void notifyA() = 0;

};
class NotifierBC
{
public:
    virtual bool notifyB() = 0;
    virtual bool notifyC() = 0;

};
class Starter
{
public:
    void start1(NotifierA* n)
    {
        n->notifyA();
    }
    void start2(NotifierBC* n)
    {
        n->notifyB();
    }
};
#endif

Hoge.cpp

#include "Hage/Hage.hpp"
#include "Hoge/Hoge.hpp"

void Hoge::test1()
{
    s_.start1(&n_);
    s_.start2(&n_);

    NotifierABC* n = new NotifierABC();
    s_.start1(n);
    s_.start2(n);
    delete n;
}

Hoge.hpp

#ifndef __HOGE_HPP__
#define __HOGE_HPP__

#include "Hage/Hage.hpp"


class NotifierABC: public NotifierA, public NotifierBC
{
public:
    void notifyA(){}
    bool notifyB(){return true;}
    bool notifyC(){return true;}
};


class Hoge
{
public:
    Hoge():s_(),n_(){}
    void test1();
private:
    Starter s_;
    NotifierABC n_;
};
#endif

Hoge.hpp(partial)

class NotifierABC: public NotifierBC, public NotifierA
{
public:
    void notifyA(){}
    bool notifyB(){return true;}
    bool notifyC(){return true;}
};

HogeTest.cpp

#include <CppUTest/TestHarness.h>

#include "Hage/Hage.hpp"
#include "Hoge/Hoge.hpp"

TEST_GROUP(FirstTestGroup)
{
};

TEST(FirstTestGroup, FirstTest)
{
    Hoge h;
    h.test1();
}

Makefile

.PHONY: all rebuild test cov clean
.SUFFIXES: .c .cpp .o

SRC:=$(shell find src/Hoge test/Hoge -name *.cpp)
OBJDIR:=test/Hoge/Obj
OBJ:=$(addprefix $(OBJDIR)/,$(subst /Hoge/,/,$(SRC:%.cpp=%.o)))
TARGET:=$(OBJDIR)/test.exe
CXXFLAGS:= --coverage -fprofile-arcs -ftest-coverage -I. -Iinclude -I/usr/local/include -g -O0 -fno-elide-constructors  -fno-inline -fno-inline-small-functions -fno-default-inline -fno-threadsafe-statics -fno-exceptions -L/usr/local/lib
#CXXFLAGS:=-coverage -I. -Iinclude -I/usr/local/include -O0 -fno-inline -fno-inline-small-functions -fno-default-inline -L/usr/local/lib -lCppUTest -lCppUTestExt
LCOV_FLAGS:=--rc lcov_branch_coverage=1
LCOVFILE:=$(OBJDIR)/lcov.info

all:$(TARGET)

rebuild:clean all

test:$(TARGET)
    ./$(TARGET)

$(TARGET):$(OBJ)
    $(CXX) $(CXXFLAGS) -o $@  -Wl,--whole-archive $^ -Wl,--no-whole-archive -lCppUTest -lCppUTestExt

#$(OBJ): $(SRC)
#   $(CXX) $(CXXFLAGS) -c $< $(OUTPUT_OPTION)


test/Hoge/Obj/src/%.o:src/Hoge/%.cpp
    -mkdir -p test/Hoge/Obj/src/
    $(CXX) $(CXXFLAGS) -o $(@:%.o=%.s) -S $^
    $(CXX) $(CXXFLAGS) -o $@ -c $^

test/Hoge/Obj/test/%.o:test/Hoge/%.cpp
    -mkdir -p test/Hoge/Obj/test/
    $(CXX) $(CXXFLAGS) -o $(@:%.o=%.s) -S $^
    $(CXX) $(CXXFLAGS) -o $@ -c $^

cov:
    lcov $(LCOV_FLAGS) -c -d . -o $(LCOVFILE)
#   lcov $(LCOV_FLAGS) -e $(LCOVFILE) "*src/Hoge*" -o $(LCOVFILE)
    genhtml $(LCOV_FLAGS) --legend -o $(OBJDIR)/html $(LCOVFILE)

clean:
    -find . \( -name "*.o" -or -name "*.gcno" -or -name "*.gcda" -or -name "*.s" \) -exec rm {} \;
    -rm -f $(TARGET) $(LCOVFILE)

#ソースコードとアセンブラの対比が見たい場合
dump:
    objdump -d -S test/Hoge/Obj/test.exe>dmp.txt

start1部分のアセンブリコード

    s_.start1(n);
   10040118a:   48 83 7d a8 00          cmpq   $0x0,-0x58(%rbp)
   10040118f:   74 1c                   je     1004011ad <_ZN4Hoge5test1Ev+0xcd>
   100401191:   48 8b 45 a8             mov    -0x58(%rbp),%rax
   100401195:   48 8d 50 08             lea    0x8(%rax),%rdx
   100401199:   48 8b 05 80 fe 01 00    mov    0x1fe80(%rip),%rax        # 100421020 <__bss_start__+0x20>
   1004011a0:   48 83 c0 01             add    $0x1,%rax
   1004011a4:   48 89 05 75 fe 01 00    mov    %rax,0x1fe75(%rip)        # 100421020 <__bss_start__+0x20>
   1004011ab:   eb 17                   jmp    1004011c4 <_ZN4Hoge5test1Ev+0xe4>
   1004011ad:   ba 00 00 00 00          mov    $0x0,%edx
   1004011b2:   48 8b 05 6f fe 01 00    mov    0x1fe6f(%rip),%rax        # 100421028 <__bss_start__+0x28>
   1004011b9:   48 83 c0 01             add    $0x1,%rax
   1004011bd:   48 89 05 64 fe 01 00    mov    %rax,0x1fe64(%rip)        # 100421028 <__bss_start__+0x28>
   1004011c4:   48 8b 45 d0             mov    -0x30(%rbp),%rax
   1004011c8:   48 89 c1                mov    %rax,%rcx
   1004011cb:   e8 30 14 01 00          callq  100412600 <_ZN7Starter6start1EP9NotifierA>
   1004011d0:   48 8b 05 59 fe 01 00    mov    0x1fe59(%rip),%rax        # 100421030 <__bss_start__+0x30>
   1004011d7:   48 83 c0 01             add    $0x1,%rax
   1004011db:   48 89 05 4e fe 01 00    mov    %rax,0x1fe4e(%rip)        # 100421030 <__bss_start__+0x30>