我用memcpy來複制由glm :: vec3對象組成的struct Vertex
。它可以在類函數中複製結構。 它在複製構造函數中不起作用,該函數在該函數返回類對象時被調用。等效的memcpy不同的結果?
爲什麼?
類函數返回對象
ShapeData ShapeGenerator::drawTriangle() {
ShapeData ret;
Vertex verts[] = {
glm::vec3(0.0f, 1.0f, 0.0f),
glm::vec3(1.0f, 0.0f, 0.0f),
glm::vec3(-1.0f, -1.0f, 0.0f),
glm::vec3(0.0f, 1.0f, 0.0f),
glm::vec3(1.0f, -1.0f, 0.0f),
glm::vec3(0.0f, 0.0f, 1.0f),
};
ret.numVerts = NUM_ARRAY_ELEMENTS(verts);
ret.verts = new Vertex[ret.numVerts];
memcpy(ret.verts, verts, sizeof(verts)); //WORKS
GLushort indicies[] = {0,1,2};
ret.numIndicies = NUM_ARRAY_ELEMENTS(indicies);
ret.indicies = new GLushort[ret.numIndicies];
memcpy(ret.indicies, indicies, sizeof(indicies));
return ret;
}
拷貝構造
ShapeData(const ShapeData& data) {
verts = new Vertex[data.numVerts];
//memcpy(verts, data.verts, sizeof(data.verts)); //DOES NOT WORK
std::copy(data.verts, data.verts + data.numVerts, verts);
indicies = new GLushort[data.numIndicies];
memcpy(indicies, data.indicies, sizeof(data.indicies));
numVerts = data.numVerts;
numIndicies = data.numIndicies;
std::cout << numVerts << std::endl;
}
頂點:
#ifndef VERTEX_H
#define VERTEX_H
#include <glm/glm.hpp>
struct Vertex {
glm::vec3 position;
glm::vec3 color;
};
#endif
我看到'綠黨[]'是頂點對象的數組,但什麼是'indices'的聲明?例如,如果它是一個指向動態內存的指針,「sizeof(indices)'將是一個指針的大小,而不是指向的數組的大小。你可以嘗試'sizeof(indices [0])* data.numIndices'。 – Davislor