Removed reference requirements, added test_chain to test chains

Author: jay-tux

inc/aggregators.hpp

@@ -28,7 +28,7 @@ namespace fpgen {
  */
 template <typename T, typename... Args,
           template <typename...> typename Container>
-Container<T, Args...> &aggregate_to(generator<T> &gen,
+Container<T, Args...> &aggregate_to(generator<T> gen,
                                     Container<T, Args...> &out) {
   while (gen) {
     out.push_back(gen());
@@ -55,7 +55,7 @@ Container<T, Args...> &aggregate_to(generator<T> &gen,
 template <typename TKey, typename TVal, typename... Args,
           template <typename...> typename Container>
 Container<TKey, TVal, Args...> &
-tup_aggregate_to(generator<std::tuple<TKey, TVal>> &gen,
+tup_aggregate_to(generator<std::tuple<TKey, TVal>> gen,
                  Container<TKey, TVal, Args...> &out) {
   while (gen) {
     std::tuple<TKey, TVal> tup = gen();
@@ -75,7 +75,7 @@ tup_aggregate_to(generator<std::tuple<TKey, TVal>> &gen,
  *  \param[in,out] gen The generator to iterate over.
  *  \returns The amount of elements in the generator.
  */
-template <typename T> size_t count(generator<T> &gen) {
+template <typename T> size_t count(generator<T> gen) {
   size_t cnt = 0;
   while (gen) {
     gen();
@@ -102,7 +102,7 @@ template <typename T> size_t count(generator<T> &gen) {
  *  \returns The final accumulator value.
  */
 template <typename TOut, typename TIn, typename Fun>
-TOut fold(generator<TIn> &gen, Fun folder) {
+TOut fold(generator<TIn> gen, Fun folder) {
   TOut value = {};
   while (gen) {
     value = folder(value, gen());
@@ -129,7 +129,7 @@ TOut fold(generator<TIn> &gen, Fun folder) {
  *  \returns The final accumulator value.
  */
 template <typename TOut, typename TIn, typename Fun>
-TOut fold(generator<TIn> &gen, Fun folder, TOut initial) {
+TOut fold(generator<TIn> gen, Fun folder, TOut initial) {
   TOut value(initial);
   while (gen) {
     value = folder(value, gen());
@@ -157,7 +157,7 @@ TOut fold(generator<TIn> &gen, Fun folder, TOut initial) {
  * now the output value.
  */
 template <typename TOut, typename TIn, typename Fun>
-TOut &fold_ref(generator<TIn> &gen, Fun folder, TOut &initial) {
+TOut &fold_ref(generator<TIn> gen, Fun folder, TOut &initial) {
   while (gen) {
     initial = folder(initial, gen());
   }
@@ -175,7 +175,7 @@ TOut &fold_ref(generator<TIn> &gen, Fun folder, TOut &initial) {
  *  \param[in,out] gen The generator to sum over.
  *  \returns The sum of all elements.
  */
-template <typename T> T sum(generator<T> &gen) {
+template <typename T> T sum(generator<T> gen) {
   T accum = {};
   while (gen) {
     accum = accum + gen();
@@ -195,7 +195,7 @@ template <typename T> T sum(generator<T> &gen) {
  *  \param[in,out] gen The generator to iterate over.
  *  \param[in] func The function to use.
  */
-template <typename T, typename Fun> void foreach (generator<T> &gen, Fun func) {
+template <typename T, typename Fun> void foreach (generator<T> gen, Fun func) {
   while (gen) {
     func(gen());
   }

inc/manipulators.hpp

@@ -25,7 +25,7 @@ namespace fpgen {
  * mapping function.
  */
 template <typename TIn, typename Fun>
-auto map(generator<TIn> &gen, Fun func)
+auto map(generator<TIn> gen, Fun func)
     -> generator<typename std::invoke_result<Fun, TIn>::type> {
   while (gen) {
     co_yield func(gen());
@@ -47,7 +47,7 @@ auto map(generator<TIn> &gen, Fun func)
  *  \returns A new generator containing tuples of values from both generators.
  */
 template <typename T1, typename T2>
-generator<std::tuple<T1, T2>> zip(generator<T1> &gen1, generator<T2> &gen2) {
+generator<std::tuple<T1, T2>> zip(generator<T1> gen1, generator<T2> gen2) {
   while (gen1 && gen2) {
     co_yield {gen1(), gen2()};
   }
@@ -70,7 +70,7 @@ generator<std::tuple<T1, T2>> zip(generator<T1> &gen1, generator<T2> &gen2) {
  * except those not matching the predicate.
  */
 template <typename T, typename Pred>
-generator<T> filter(generator<T> &gen, Pred p) {
+generator<T> filter(generator<T> gen, Pred p) {
   while (gen) {
     T val(gen());
     if (p(val))

test/src/test_chain.cpp

@@ -0,0 +1,6 @@
+#include "aggregators.hpp"
+#include "generator.hpp"
+#include "manipulators.hpp"
+#include "sources.hpp"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"