@wwzhao
简单的感受了一下两种赋值方式，效率确实很大提高。
#include <stdio.h> #include <string> #include <chrono> #include <iostream> using namespace std ; class Timer { private: // Type aliases to make accessing nested type easier using clock_t = std::chrono::high_resolution_clock; using second_t = std::chrono::duration<double, std::ratio<1> >; std::chrono::time_point<clock_t> m_beg; public: Timer() : m_beg(clock_t::now()) { } void reset() { m_beg = clock_t::now(); } double elapsed() const { return std::chrono::duration_cast<second_t>(clock_t::now() - m_beg).count(); } }; class SomethingBefore11 { private: int m_array[5]; public: SomethingBefore11() // zero the member array { // If we want the array to have values, we'll have to use assignment here m_array[0] = 1; m_array[1] = 2; m_array[2] = 3; m_array[3] = 4; m_array[4] = 5; } }; class SomethingAfter11 { private: int m_array[5]; public: SomethingAfter11(): m_array { 1, 2, 3, 4, 5 } //zero the member array { } }; int main(){ Timer tBefore11; SomethingBefore11 m_array_before11; std::cout << "Time elapsed: " << tBefore11.elapsed() << ‘n’; Timer tAfter11; SomethingAfter11 m_array_after11; std::cout << "Time elapsed: " << tAfter11.elapsed() << ‘n’; return 0; } [xx OFtutorial0_helloWorld]$ whatAboutThisGuy Time elapsed: 7.506e-06 Time elapsed: 1.47e-07 [xx OFtutorial0_helloWorld]$ whatAboutThisGuy Time elapsed: 8.664e-06 Time elapsed: 1.9e-07 [xx OFtutorial0_helloWorld]$ whatAboutThisGuy Time elapsed: 7.646e-06 Time elapsed: 1.89e-07
