我对 c++ 的了解有限。我尝试编译一个 c++ 库,当我为以下头文件运行 make 文件时
mcmc_dhs.h
#include <algorithm>
#include <map>
// intrinsic shape and (reduced) shear just add?
//#define WLNOISE
// use shear instead of reduced shear for model
//#define NOREDSHEAR
/// parameters for the M200-concentration relation
const number mcreal[2] = {9.59,-0.102}; // Dolag et al. (2004)
//const number mcreal[2] = {5.26,-0.100}; // Neto et al. (2007) [Millenium Run]
/// critical density at z=0 (h100=1) in [Msun/Mpc^3]
const number rhocrit = exp(log(rhoCrit)+3.*log(Mpc)-log(Msun));
/// two extra halo parameters: r200 (and concentration: 2)
#define PARAMS 1
/// define region (square; twice value here) about halo that considers sources for model
#define REGION 10.0*arcmin
class mcmc_dhs : public mcmc
{
public:
mcmc_dhs() :
data(), cosmohandler(0.3,0.7,0.21,0.8,0.04),
lenseff(), intrvar()
{
boundaries =
{{0,512},{0,512},{0.01,5.},{100.,3000.},{0.1,50}};
}
~mcmc_dhs() {}
/// size of grid for looking up sources
static const int Ngrid = 200;
它返回以下错误信息:
mcmc_dhs.h:55:67: warning: extended initializer lists only available with -std=c++11 or -std=gnu++11 [enabled by default]
boundaries = {{0,512},{0,512},{0.01,5.},{100.,3000.},{0.1,50}};
^
mcmc_dhs.h:55:17: error: assigning to an array from an initializer list
boundaries = {{0,512},{0,512},{0.01,5.},{100.,3000.},{0.1,50}};
^
In file included from ../modules/matrix.h:15:0,
from ../modules/probdensity.h:4,
from ../modules/mcmc.h:4,
from mcmc_dhs.h:4,
最佳答案
不能在数组声明后直接赋值给它。基本上你的代码是一样的
int main()
{
double arr[2][2];
arr = { {1, 2}, {3, 4.5} }; // error
}
你必须在声明时赋值
double arr[2][2] = { {1, 2}, {3, 4.5} };
或使用循环(或std::copy
)来分配元素。由于你的数组好像是一个成员变量,你也可以在构造函数初始化列表中初始化它:
mcmc_dhs() : data(), cosmohandler(0.3,0.7,0.21,0.8,0.04),
lenseff(), intrvar(),
boundaries{{0,512},{0,512},{0.01,5.},{100.,3000.},{0.1,50}}
{
// rest of ctor implementation
}
关于c++ - 如何从初始化列表中分配一个数组?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30178879/