请求'ionDistance'中的成员'begin'，这是非类型'float *'

Question

我已经编写了下面的代码，我收到了错误。我做错了什么？

float sampledEnergies ( float ionDistance[], float ionEnergy[])
{

float   samTime[1000];
float   simPos[1000];
float   closeEnergy[1000];
float   close;
int     maxSamples = chamberLength / (driftVel * adcSampleRate);

for (int i = 0; i < maxSamples; i++)
{
    samTime[i] = i * adcSampleRate; 
    simPos[i] = chamberLength - (driftVel * samTime[i]);
    printf("%.2f\t%.2f\n",samTime[i],simPos[i]);

    close = lower_bound(ionDistance.begin(),ionDistance.end(), simPos[i]);

    for (int j = 0; j < maxSamples; j++)
    {
        if (close = ionDistance[j])
        {
            closeEnergy[i] = ionEnergy[j];
        }
    }       
}

} 

以上是代码，错误如下。

TBraggSimulation_v1.cpp: In function ‘float sampledEnergies(float*, float*)’:
TBraggSimulation_v1.cpp:37: error: request for member ‘begin’ in ‘ionDistance’, which is of non-class type ‘float*’
TBraggSimulation_v1.cpp:37: error: request for member ‘end’ in ‘ionDistance’, which is of non-class type ‘float*’

Answer 1

您的ionDistance是一个指针（指向数组的第一个元素），而不是标准库容器。您的代码尝试调用begin和end，它们仅为容器定义。

要获取指针的一系列迭代器，请使用：

lower_bound(ionDistance, ionDistance + n, simPos[i]);

此处n是ionDistance数组中元素的数量。我不明白你的代码足以暗示它等于maxSamples;如果不是，请在函数中添加一个参数：

float sampledEnergies ( float ionDistance[], float ionEnergy[], size_t numIons)
{
    lower_bound(ionDistance,ionDistance + numIons, simPos[i]);
}