相关疑难解决方法(0)

我尝试使用Google搜索和Stack Overflow搜索,但它没有显示任何结果.我在开源库代码中看到了这个:

Notification notification = new Notification(icon, tickerText, when);
notification.defaults |= Notification.DEFAULT_SOUND;
notification.defaults |= Notification.DEFAULT_VIBRATE;

"| ="(pipe equal operator)是什么意思？

我有一部分代码包含以下功能：

void Keyboard(int key)
{
    switch (key) {
    case GLFW_KEY_A: m_controlState |= TDC_LEFT; break;
    case GLFW_KEY_D: m_controlState |= TDC_RIGHT; break;
    case GLFW_KEY_W: m_controlState |= TDC_UP; break;
    case GLFW_KEY_S: m_controlState |= TDC_DOWN; break;
    default: Test::Keyboard(key);
    }
}

void KeyboardUp( int key)
{
    switch (key) {
    case GLFW_KEY_A: m_controlState &= ~TDC_LEFT; break;
    case GLFW_KEY_D: m_controlState &= ~TDC_RIGHT; break;
    case GLFW_KEY_W: m_controlState &= ~TDC_UP; break;
    case GLFW_KEY_S: m_controlState &= ~TDC_DOWN; break;
    default: Test::Keyboard(key);
    }
}

我知道开关盒是什么，但我不明白这些部件的作用。

m_controlState |= TDC_LEFT
m_controlState &= ~TDC_LEFT

m_controlState …

我有代码行

int i =0;
result |= EXPECT_EQUAL(list.size(),     3);

什么|=男子？

我试图编译类似的东西:

int result |= 5;

但得到了错误:

aaa.cpp:26:16: error: expected initializer before ‘|=’ token