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Update index.md to wrap PRNG in std::ref for std::bind calls #496

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Update index.md to wrap PRNG in std::ref for std::bind calls #496

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11 changes: 6 additions & 5 deletions content/languages/cpp/authoring/index.md
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Original file line number Diff line number Diff line change
Expand Up @@ -196,8 +196,8 @@ std::uniform_int_distribution< char> rand_bool { 0, 1 };
// etc.

// for convenience, distributions can be bound with PRNG
auto gen_length = std::bind(rand_length, engine);
auto gen_letter = std::bind(rand_letter, engine);
auto gen_length = std::bind(rand_length, std::ref(engine));
auto gen_letter = std::bind(rand_letter, std::ref(engine));

std::string input;
// input string generator: string of random length, composed of random letters
Expand Down Expand Up @@ -281,6 +281,7 @@ Below you can find an example test suite that covers most of the common scenario
#include <algorithm>
#include <random>
#include <sstream>
#include <functional>
#include <string>

Describe(FixedTests) {
Expand Down Expand Up @@ -315,9 +316,9 @@ Describe(RandomTests) {
private:

std::mt19937 engine{ std::random_device{}() };
std::function<int ()> gen_number = std::bind(std::uniform_int_distribution<int >{ 1, 100 }, engine);
std::function<size_t()> gen_small_size = std::bind(std::uniform_int_distribution<size_t>{ 2, 10 }, engine);
std::function<size_t()> gen_large_size = std::bind(std::uniform_int_distribution<size_t>{ 80, 100 }, engine);
std::function<int ()> gen_number = std::bind(std::uniform_int_distribution<int >{ 1, 100 }, std::ref(engine));
std::function<size_t()> gen_small_size = std::bind(std::uniform_int_distribution<size_t>{ 2, 10 }, std::ref(engine));
std::function<size_t()> gen_large_size = std::bind(std::uniform_int_distribution<size_t>{ 80, 100 }, std::ref(engine));

// random test case generator
std::vector<int> generate_random_input(size_t size) {
Expand Down