Initializing Arbitrary Precision integers

The ap_[u]int types can be constructed and assigned to from other arbitrary precision integers, C++ integral types, ap_[u]fixpt types, as well as concatenations and bit selections. They can also be initialized from a hexadecimal string describing the exact bits.

Some examples of initializing arbitrary precision integer types are show below.

#include "hls/ap_fixpt.hpp"
#include "hls/ap_int.hpp"
#include <iostream>
#include <stdio.h>

using namespace hls;

    //...
    // Initialized to -7
    ap_int<4> int1 = -7;
    std::cout << "int1 = " << int1 << std::endl;

    // Initialized to 15
    // The bits below the decimal are truncated.
    ap_uint<4> int2 = ap_ufixpt<5, 4, AP_RND, AP_SAT>(15.5);
    std::cout << "int2 = " << int2 << std::endl;

    // Initialized to 132
    // Could also write "0x84"
    // The 0x is optional
    ap_uint<8> int3("84");
    std::cout << "int3 = " << int3 << std::endl;

    // Initialized to 4
    // Bit selections are zero extended to match widths
    ap_int<4> int4 = int3(2, 0);
    std::cout << "int4 = " << int4 << std::endl;

    // Initialized to 128
    // ap_uint types are zero extended to match widths
    // ap_int types are sign extended to match widths
    ap_int<16> int5 = ap_uint<8>("80");
    std::cout << "int5 = " << int5 << std::endl;

    // Initialized to 2
    // The value 4098 (= 4096 + 2) is wrapped to 2
    ap_uint<12> int6 = 4098;
    std::cout << "int6 = " << int6 << std::endl;