C++学习（四八二）std string用法

std::string::size_type start_pos, std::string::size_type num_chars

str.substr(start_pos+1, num_chars-1)

std::string::size_type pos = 0;
pos=str.find_first_of("$'\"", pos)
pos = str.find_first_not_of("ABCDEFGHIJKLMNOPQRTSUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_", pos);

_valueMap[name] = value = str;

std::string::size_type declPos = source.rfind( "#version " );

std::string dectypesarray[] = {"float oe_layer_rangeOpacity",
                                                   "vec4 vp_Vertex",
                             &nb