编译器错误 C3025

“clause”：应为整型表达式

子句需要整型表达式，但提供了非整型表达式。

示例

下面的示例生成 C3025。

// C3025.cpp
// compile with: /openmp /link vcomps.lib
#include <stdio.h>
#include "omp.h"

float f = 2.0F;

int main()
{
    int i = 0;

    // OK
    puts("Test with int");
    #pragma omp parallel for num_threads(i)
    for (i = 1; i <= 2; ++i)
        printf_s("Hello World - thread %d - iteration %d\n",
                 omp_get_thread_num(), i);

    puts("Test with float");
    #pragma omp parallel for num_threads(f)   // C3025
    for (i = 1; i <= 2; ++i)
        printf_s("Hello World - thread %d - iteration %d\n",
                 omp_get_thread_num(), i);
}